We've seen this happen already once with the recovery of palimpsests. Outside of a few lucky discoveries, the vast majority of what monks were discarding were things that were not seen as useful - outdated (to them) legal texts, liturgical books, etc.

The exception though would be Greek literature. Greek literacy collapsed in the early medieval era and a large catalogue was probably just scrapped or discarded before even being collected in Monasteries. Herculaneum could represent a legitimate treasure trove in that regard.

A _lot_ of greek literature survived via the Byzantine Empire and through Arabic translation, though.