Well if nothing else keep letting son know that if/when he decides to part with it, to let you know.... Cause chances are if he is finding it harder and harder to think of letting it go, then if he does let it go, he'll regret it (trust me I know for a fact)... and at least he'll have a better chance of getting it back, or at least knowing it's being taken care of and having some visitation rights with it...