Items are NOT ALLOWED in letter envelopes. Letters must be flat and flexible all the way across. The letter-processing equipment are far too harsh on letter envelopes containing items other than paper. The envelopes will be shredded, and the contents will be separated. You can send small, flat items in envelope boxes if you prefer. These should be packed in layers of no more than 15 items deep, with each item standing upright or lying down flat. Packages should be wrapped in plastic wrap or sealed in a box or bag made of clear material (not black) to avoid absorbing moisture from the atmosphere that could lead to mold growth. Large items such as furniture and appliances should be sent through any large postal office or shipping company. Most have special facilities for handling these types of items. They will be handled with care and shipped when fully repaired or replaced items are returned. If you choose to use a private carrier, they will require a mailing address, phone number, and email address. They will not deliver to P.O. boxes or apartments without a physical address. Mailboxes are available at most post offices, but they are also available online. If you order one online, it will be ready to pick up at your local post office. There are two types of mailboxes: open and closed.