This kid is just going to continue to act up. Might as well just not have gotten it for him.
The empty box stunt is foolish. Also this boy needs to learn how to appropriately open the box and infer contents based on weight. Step your grades up son.
He really should have known that nothing was in it when he was able to life the box with no effort. I used to be able to figure out what my presents were based on weight and size of the box but my parents caught on and started altering the presents by doing things like hiding games in a clothing box and stuffing it full of paper so that I couldn't hear them rattling around inside.
This stunt is something you pull on a regular day, NOT CHRISTMAS. He might just keep his grades down just to spite them.