I've bought Richard Bloch's (Impossible Dream) nest of boxes with the Joe Proper's strong box.
It's well made and well worth the cost. It's the best nest of boxes set I had ever bought. This can be done close-up.
Anyone on the Café who owns this and want to PM me on some changes I've made with the set to make it more fool proof and work's smoother.
To prove that you own one --include the measurements of the strong box bottom, it's not the same size of the Proper strong box. Also, what could go wrong if the item borrowed is metal ring or coin. If you have the set you'll know what I mean.
Ricky

Collectors Workshop was sold out before and the new stock is almost gone. So, there are owners out there.
My way of doing it requires no palming at all, and the ring is gone south before they know it.
Ricky