Rip and restore a Tic Tac box cover!
Imagine this. You show a Tic Tac box front and back, and you show your two hands empty. RIP the box cover off. Everyone can see that it has clearly been removed from the package. You then magically restore it, letting your audience see that it is now firmly attached once again. Show your hand empty and hand the box out for examination.
A real puzzler!