The pizza is long gone, but does anyone else wonder what the guy who accepted the 10,000 BTC ($380,700,000) did with them and does he have any left?

No one for sure but I think he spend it already before, well if you really could know what will happen in the future even me wouldn't sell it if I could know that this would happen.
Well right now you can buy almost anything using Bitcoin a few years before you need to find users who will accept Bitcoin in exchange of pizza.