The toy that isn't a toy

Tupperware....plastic Gladware...anything that he can't break is great to play with in the kitchen.  He thinks he is getting away with something by even being in the kitchen and is happy to just open and shut the door.  It provided about 15 minutes of entertainment though and that is a long time these days.
I have set aside this cupboard just for him to get into...the others are OFF limits!
~crystal