This doesn’t make a lot of sense to me. If Berger stole these documents to hide something, why would they end up in the library? (Hiding in plain sight....?)
Trying to get so many copies of the same document suggests that he wasn't interested in destroying the original, but rather handwritten comments on some copies. I wonder if XXX-42 said something about Osama bin Ladin which people in a meeting wrote down that would be damning to his administration after 9/11.