First, familarize yourself with the contents of his store. You can look closely at ONE of the baskets... When you look at it, the screen will change to let you see just that basket (and its contents), and in it will be a prosthetic hand.
Once you know exactly how to get to it, THEN use the music box on Deadeye Dave, so you can get to the prosthetic hand quickly.
Energizer Bunny arrested, charged with battery.