Beautifully constructed wood box with a little lock. Use it to produce coins or a ring, after having made the object vanish elsewhere.
Imagine borrowing a spectator's ring during your routine, and vanishing it in your favorite way. (You could also use a device such as the Rattle Box to secretly make the ring disappear under your control). Later in the routine, you give the spectator the key to this locked box, and let her open it. Inside, safe and sound, is her ring!
This effect is also known as Lippincott Box.
