Well, he hasn't had them *all* since he was a kid. He's been an avid collector in recent years as well. It's just a thing he's accumulated over time. I don't doubt that overall he showed a loss - it was a big collection, and considering the size it didn't sell for much by my reckoning (I'm no expert in baseball cards, though). All I really have to work with at the moment is the 1099K and his statement as to what he spent on it (he has a spreadsheet showing it). He's solidly in the 22% bracket for 2024, filing single.