RATTLE BOX

The performer drops a borrowed and marked coin into a small wooden box. The box is wrapped in a handkerchief, and given to a spectator to hold. The spectator can hear his coin rattling inside the box, proving the coin is still there. With a snap of his fingers, performer causes the coin to vanish. When the spectator shakes the box, it is clearly empty. He unwraps the box – the coin is gone.  

The same marked coin is now found inside a ball of wool, or a locked chest, which has not been touched by the performer after the coin vanished. 
A classic prop, well made in wood, and one you can use in your close-up or platform performance.  Size 4″ L x 2.6″ W x 1.5 H”