I read an interesting online story a while back where a signifcant quantity of the library's contents are copied out, and stored away in a cave in Egyptian/Sinai desert somewhere. The original plan of the people who did so, was to come back at a later poit to retrieve the stuff, but RL intervened, and nobody did. There they were forgotten for aa few centuries, until a Christian monastery was built next door, they found some of the stuff and added it to their library. Fast forward to the present, and the monastery's on the verge of closing down, when a local village boy helps one of the monks auction a book from the library on ebay. It attracts the attention of a German professor, who purchasesit, and then when the realization is made that it comes from Alexandria originally, a huge archaeological dig is mounted in the surrounding area, which leads to the recovery ofa significant amount of Alexandrine codices/artifacts. Among these artifacts is a text that talks of Atlantis - in far greater detail than Plato - and then the story goes a little off the rails. But I figure if there are Biblical texts that were discovered in a similar manner - Codex Sinaiticus for instance, Nag Hammadi scrolls, Dead Sea scrolls, it makes it sort of plausible, if only as a convenient vehicle for the story.