If the document ends up as an attachment to a court filing the court will throw out the filing if the attachments are not properly identified. There are a few libraries that will not do both because of copyright laws. When deciding on a source for an interlibrary loan generally the turn around time from college, university, and private libraries is faster than public libraries. Public libraries are one of the few sources that will actually check a shelf for an item. Only once in a blue moon will a college librarian check a shelf.
Many universities have a special service in addition to interlibrary loan that deal with businesses.
UC San Diego for example has a service called Corporate Plus. Services such as these will charge more than interlibrary loan. If you do not have the staff or time to do document retrieval there are many commercial services that will do it for you. These services can locate items for you, retrieve them, and arrange interlibrary loans. One of the best sources for such services is The Burwell World Directory of Information Brokers.