All of Aristotle's 'popular' works (mainly the Dialogues) have been lost and are known only through references. It's an irony of history that what we have are all his unpublished treatises but none of the actual material widely read by the ancient world. I would bet money that his popular works will be found at the Villa of the Papyri, because no Roman library would've been complete without them. How exciting!
BTW, his foremost student Theophrastus was considered by the ancients to rival Aristotle and Plato in the breadth and novelty of his writings. None of his major works have survived to the present but in fragments and finding any of them would be no less exciting.
If I'm not mistaken, we think we may only have student notes from his lectures!
The Romans praised Aristotle's dialogues to the sky. To catch even one, let alone several, is such a thought that I can't believe this project was in disrepair!