i know him in real life. i can go over to his house.
Uh hun, and you're going to search every little bit of every computer he has?
Every hidden folder? Every website in his browsing history (assuming he's never cleared it) that he could have uploaded it to?
Every header file of every bmp image? (that picture of a flower might really be where he keeps your social security number, bro)
Point is, once you give someone something digitally, you can never get it back from them.