A card is selected and lost in the deck. This deck is put in it case and the case is sealed. The seal is initialed by the spectator. The case is placed into the spectator's empty coat pocket.
The magician now extracts the selection from the case...In under three seconds!
The case is removed from the pocket. The seal is unbroken! The cards are removed from the case and counted. There are only 51. The selection is gone!