Paper

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Paper is a unique, artisanal and luxury consumer product, exported from precious few colony worlds. Typically it is utilised as a status symbol, as it can become prohibitively expensive for general use the further away from a source of production it is shipped. 
In museum exhibits, high-price libraries, or luxury hotels, paper is used generously to add authenticity to books, pamphlets, decorations, or even for high-class cigarette rolling, sold in hotel lobbies or gift shops. Paper is also utilised for the storage of classified military documents, the transportation of intelligence, and smart paper has even been used to encrypt data as bytes of information located within the processing cores of holographic microprojectors. 
Paper is chosen for this as it is the belief of the Office that paper products cannot be stolen except by those who have access to the filing cabinets and storage closets in which they is stored. It is the belief of the Office that Electronic data, on the other hand, in an era of omnipresent, ubiquitous AI, can be stolen by anyone with a sufficiently powerful Artificial Intelligence or Glitchdreamer Suite installed in their Neural Implants.
The UEG and its various departments also adopt a similar mindset when dealing with matters of bureaucracy, particularly drafts of laws, litigation, and legislature. Paper is a convenient way to save on digital storage space, retain the traditional due process of Old Earth governmental customs, and avoid junk data clogging up the bureaucratic pathways. The average law or legislation can be copied digitally over a hundred thousand times, circulated to various onworld and offworld officials, or kept in data packets circulating the Sol comms network. Paper removes much of this 'E-Waste', and paper can be more readily recycled or disposed of.
Smart paper disposal involves the wholesale shredding of both it and the microprojectors within the paper fibres. This is done in part due to the processes involved with placing the projectors into the fibres. TO remove them would be cost-inefficient, but shredding the entire thing and separating the metals from the pulp is easier.
In the event of monoethylhydroxide paper sheets, sheets marked for disposal can be returned to plastic rendering plants, melted down, and re-used.
Paper is a civilian consumable as well. The ubiquitous continued use of cigars, cigarettes, joints, roll-ups, and product packaging for foodstuffs ensures a steady civilian demand. However, typical food packaging is composed of smart paper to promote the brands, or it is simply wrapped in monoethylhydroxide biodegradable snailgrass plastic. Cardboard boxes and shipping cartons are rare, usually left unused in favour of the security that metal crates offer.
Despite its commonplace appearance in many civilian markets, paper is something of a rarity. It is entirely possible for a civilian to go without seeing sheets of A4, printing paper, or even books for their entire lives, particularly among the Inner Colonies.
=Smart Paper=
"Smart" paper is made from either wood pulp or Monoethylhydroxide sheets, layered and compressed into a thin mass, and inlaid with display devices and microprojectors to allow for a foldable, yet interactive user interface. Due to its fragility and relative propensity to be easily damaged, it is seldom-used in any capacity save for maps, novelty goods, or for 'interactive product packaging'.
Despite the fragility and cost, paper money is a major source of Smart Paper, as is food packaging and brand-name wrappers. The mainstay is the technology inherent within smart paper, the microprojectors are a convenient method of expression. Civilian clothing markets make use of the tech to advertise brands, though layering an entire outfit with the tech is prohibitively expensive, and thus reserved for upper class individuals who can afford the custom tailoring inherent in the creation of 'Smart Cloth'.
There's also a chance for 'Smart Paper' and 'Smart Cloth' to be 'Jailbroken', in which hackers, Glitchdreamers, or even AI can alter the display of the projectors into whatever they desire. Civilians with access to smart clothing often use the items to advertise themselves in some way. Social medias, ideologies, some even intentionally program the cloth to display tattoos they may have, some program a distressed look to the cloth, showing off fake rips or tears. 
Further still, some even utilise smart cloth to flout public decency laws by exploiting a loophole, in that they are technically still clothed, while using the projectors to display themselves for all to see. Smart cloth and the technology inherent within it is a relatively new addition to the UEG and wider Human society, and has been described as politicians as 'the most frivolous usage of computer technology', or 'the greatest method of self-expression since man first put charcoal to paper'. It remains a hotly-debated topic within the UEG Senate, both it and potential restrictions on limiting its usage.
Smart Paper technology is so energy efficient that it can be perpetually charged by ambient daylight, interior lighting, body heat, or even the light and heat of a flashlight.
Smart paper made for military or artisanal use is typically made from wood pulp, whereas general-issue Civilian-grade smart paper retains the Monoethylhydroxide mesh. An easy way to check is to wet the skin, and rub the paper onto the wet patch. 99.9% of humans are mildly allergic to an active compound and impurities found within Monoethylhydroxide, and so if the skin raises, breaks out into hives, swells, or suffers any other reaction, then the paper is made from Monoethylhydroxide, and not wood pulp.
In terms of paper money, the expense and risk of inlaying microprojectors with the cloth is offset by the opportunity cost of preventing counterfeiting. While typical credits traded among colonies are typically small, coin-or-card-like lumps of plastic with pre-programmed amounts on them, paper money is a major source of SolCore and Inner Colony wealth.
=Paper Currency=
Paper Currency is still utilised on many of the Sol Colonies, and has become a staple of Sol stability and financial security. They are accepted denominations of Credits, and retain identical values to Credit Chips (which are predetermined denominations within coin-like 'chips'), Credit Cards (single or multi-use card-like currencies), 'Chitpicks' (similar to coins except the denomination is fixed), and 'Scatterings' (card-like currencies designed to break apart into multiple component pieces for payment).
Paper Currency is the preferred denomination of many interstellar traders, who leverage the backing of Sol-based headquarters and thus Sol-based banking industries to add political capital and influence to their corporate export holdings, and thus are allocated priority clearance when it comes to Slipspace wait times, port clearance priority, waived or reduced berthing fees, etc etc.
The paper that Paper Currency is printed on is invariably inlaid with many of the hallmarks of Smart Paper, in order to prevent counterfeit cash industries, and to prevent 'Duping' or 'Cracking', as is common with other types of Credit currency. Prior to the Human-Covenant War, paper currency was filtering outward bound to the Epsilon Eridani colony worlds, and beyond to other planets within the ever-growing Inner Colony sphere.
The weight behind paper currency has lead to it being hailed as 'the only money worth double what it says'. This is less to do with the inherent purchasing power of the currency when in general use, but rather the attached political weight and social status that comes with its use. The more a person's liquidity is tied to paper money, the more respectable they are in the Inner Colonies, as in an era of digitised banking and 'quirky' credit denominations, a physical display of wealth and prowess carries all the more sophistication and significance.
=Novelty Goods=
Paper novelty goods are an expensive, if crude, use of paper, to either produce interactive cards, personalised messages, business cards, invitations, event leaflets, brochures, or maps of a specified area. Maps especially remain in use by members of Planetary Militias, Planetary Defence Forces, and even some UNSC elements, as Smart Paper does not require a dedicated power source beyond ambient light, and body heat.
Novelty goods are a fringe market, and it has been debated as to whether or not 'Smart Cloth' and 'Smart Clothing' falls under the definition. Like many things, this new technology is expected to become less expensive as time goes on, and thus it shall filter out more and more into general use.
The personalised mail industry is said to be dying out, though it continuously remains active, typically operating at even cost-to-profit ratios. This is due to the fact that it isn't one single 'industry', per-se, but rather it operates as one whilst being supported by many other components. For example, stores which sell books will also sell business cards and birthday cards. Museums that offer gift-ship memorabilia also offer guide pamphlets at-cost, maps of the location, replicas of historical artefacts, reprints of famous post-Interplanetary novels, etc. Printing stores will do novelty photographs inlaid with microprojectors, and so on. 
The novelty goods industry is decentralised, and thus clings to life in the most charming of ways among a society that has largely out-grown single-use cards and well-wishing post-its.
=Books=
Books remain one of the main uses for true paper. Typically true 'antique-grade' books utilise wood pulp paper, but books found in circulation within civilian markets can also be made from imitation Monoethylhydroxide sheets. Libraries, while offering a copious and expansive electronic database of e-books and 'printed' materials, also offer a secondary service;
For a fee, any book, novel, printed work, textbook, or anything within the databases can be printed onto paper, bound, and sold-to-keep. For an additional fee, the cover may be made out of Smart Paper, with a representation of a pivotal scene or theme within the work. This can become expensive, but some civilians enjoy the feel of a printed book over reading from a screen.
Books are as much collectors items as they are consumer goods, the most avid of collectors do not read them, or even crease the spine. The market for books is such that pristine covers sell for more. Unbent spines, unfolded pages, and genuine leather and wood board binding all contribute to the price of a collector's book.
Libraries offer a simplistic binding service, in which either faux leather, cardboard, plastic sleeves, or other materials are used to protect the book from the elements. Library books are also exceedingly cheap in collector's circles, though intense, avid attempts to counterfeit and fool the more entry-level collectors and bibliophiles are gaining increasing popularity, as greater droves of wealthy and affluent individuals flock to paper books as symbols of status and intellect.
In recent years the Office of Naval Intelligence has been circulating politically-charged manifestos around the Book Collector's markets, white, grey, and black. Those who buy said manifestos, manuscripts, and politically-charged works are considered 'persons of interest', and are subject to scrutiny and observation.
Rarely are the buyers of said pieces purchasing with intent to distribute, or because they support the ideology. Typically they merely want centrepieces to controversial collections, conversation points among the affluent, or for bragging rights. Much like physical artwork, books remain a mainstay of political dialogue and ideas.
=Artwork=
Traditional artist canvas remains either linen or flax, though the use of paper and its elevated status remains a major contributor to the world of traditional art. Smart paper is also utilised to the same extent within the art industry as it is in others, because with smart paper, the actual paper is not printed on, the images are merely projected onto the paper by the microprojectors 
The use of smart paper to display interactive artwork is used to some extent in certain exhibits, typically detailing a stylised glimpse into the artist's life, their journey, and processes.
=Counterfeiting=
Counterfeit paper is 'paper' produced from Monoethylhydroxide, the active ingredient found within 'Snailgrass' biodegradable plastics. Commonly Monoethylhydroxide is utilised in food and cargo packaging, but melting it and layering it in sheets with white food colouring can produce a visually-identical material that many casual civilian observers will be fooled by. As it is cheaper than artisanal paper, Monoethylhydrozide sheets are used in ceremonial contract signings and as props to pad out non-readable, replica museum books.