How so? Sure he may get done for selling stolen property but apparently the money was for exclusivity, so who knows, everything is pretty circumstantial and really what would Apple get out of this? Maybe a bit of money, but even that's unlikely since he is a student, what would be the point of pursuing it?
It's a sad day when we impose such obligations by law (that's if we do - you made no citation). Theft requires the intent to deprive somebody of their possession. No such intent can be proven here since the dude merely found something *AND* made an attempt to return it. He is under no obligation to return it and shouldn't be.