1.5 years ago, in 2014, they received a copy of an unreleased PSP game, titled Duke Nukem Critical Mass: https://blogs.loc.gov/digitalpreservation/2014/08/dukes-lega...
Reading the blog post, it seems they are not competent enough to actually run it, and the best they could do was to open the main executable (BOOT.BIN, the decrypted version) in a hex editor. Some commenters even tried to help them run it, of course without any reply. 1.5 years later, the files are still not available to download, and that disk is basically rotting away somewhere in the "library".
Please, if you are a game developer, and care about game preservation, don't submit your games to that library. Instead, upload them anonymously to a torrent tracker of your choice. The internet will do the rest.
copyright laws suck.