About 30 years ago, 27 wooden crates filled with postal operations and philatelic* objects from the Smithsonian Institution’s National Philatelic Collection were shipped to a Smithsonian storage facility. The crates went untouched until 2007 because of a lack of space for processing and storage. It was not until the United States Postal Service provided the National Postal Museum with a facility that the process of opening the crates and inspecting their largely unknown contents began.
*Philatelic - relating to the collection and study of postage stamps, revenue stamps, stamped envelopes, postmarks, postal cards, covers, and similar material relating to postal history. (Dictionary.com)