My wallet was found 5 years later, what’s going on?

I lost my wallet in October 2019, and I got an email 1 hour ago saying it was turned in today.

Apparently I’m not the only one, “a graduate student had dropped off 3 wallets earlier today stating they found them in one of the classrooms on our floor. This has happened a few times in the past month [with wallets lost months or years ago], so we're not really sure how this happened/how the wallets are turning up.”

Anyone have a clue what is going on? Confirmed with pictures the wallet is mine.