The Archival Recovery Team of the National Archives and Records Administration (NARA) investigates documents and other items that have been lost or stolen from NARA, utilizing news, auction houses and websites, collector shows, and tips. Operating as part of NARA's Office of the Inspector General, they have had some notable successes in recovering items like presidential pardons from Ulysses S. Grant and Andrew Jackson or a Frederic Remington bronco statue given to George H.W. Bush.
There is considerable challenge in monitoring the National Archives, which contain more than ten billion letters, maps, reports, videos, and audio recordings, hundreds of thousands of artifacts, and 6.7 billion electronic files. A comprehensive item-by-item inventory has never been performed because of this size, so even recognizing that items are missing is difficult.
To date, the team has recovered over 7000 items.