One thing I try to do with Jack is not acuse him of something if there is any doubt about whether or not it was him. I know that most of the time it will have been him, but there are times when it's not. So if I haven't seen it, I will make a comment about it, along the lines of "That shouldn't be out of the cupboard should it." and then leave it at that. Later on if I see him in the cupboard I will ask him to stop and take whatever next step is appropriate. At least this way he can't argue that it wasn't him. HTH.