The great Greek philosopher founded a philosophy school at the Lyceum in Athens, ~335 BC.

Its library was 10,000+ scrolls, and it included all of Aristotle's works (likely the lost Dialogues) and perhaps lost works by pre-Socratic philosophers.

What happened?

The Lyceum's library was eventually inherited by the scholar Neleus, who allegedly took it with him when he moved to Asia Minor.

From there, we lose track, though it is likely the collection was broken up, some maybe eventually reaching Pergamum or Alexandria.