A coin, ring, or any small object is placed in the box. Shake the box- the object can be heard rattling inside. At any time (even in mid-rattle), the object can be made to vanish from the box. The box is opened- it is really empty!
Made of dark varnished solid wood.
For a nice routine, produce the item again using the Spellbinding Boxes (for a coin) or the Quarter Go Box (for a small object like a ring).