YOU NOD, WHICH THE SHOPKEEP CELEBRATES WITH A RELIEVED SIGH, AND GOES BACK TO TAPPING THE DESK.
NOW IS YOUR MOMENT...
YOU TURN YOUR BACK TO THE SHOPKEEP, KEEPING THE BOX JUST IN FRONT OF YOU, SO YOUR BACK COVERS UP WHAT YOU'RE DOING IN THE FRONT.
WHERE COULD THAT KEY BE...?
[GENTLY SHAKE BOX] [SEARCH YOUR POCKETS]