The problem is though that there is no cold hard proof that it's him only speculation. I'm all for confrontation when its warranted but thats really up to the op if she feels it's approriate.

I do agree that the police should be involved, as it is an expensive item but standing at the thief's door until you get removed by the police just doesn't seem practical at all. There are other ways of dealing with a situation like this and I would say at this point to simply get the police involved.

Needless to say, and I'm sure you already know, I would be very careful about my childs interaction with this boy moving forward.

I'm sorry you and your son have to go through this. My son would be pretty upset if it happened to him.