Arrowheads survive, arrows don’t. The library contents probably were carried off by Romans, burned by barbarian hordes, or recycled at some nearby Dark Age monastery.
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IF this is legit 2000 years old, that is about the right time for it all to get sacked by the Romans, and they had a particular passion for destroying the cultures they encountered. But I think you are right, it would be a miracle if actual materials (writing from the time) survived regardless
I’ve never understood how almost everything ancient is under so many feet of dirt. It seems that if building on something else you would take it down to the foundations and reuse only that.
What are you talking about? The library was Roman, built by Romans, and located in a Roman city!