Double Locked Box Mystery (M8/902)

Start with a paper bag on your table.
Borrow a spectator's ring and vanish it by your chosen method.
Reach into the back and take out a beautiful wooden box with a lock on the front.
Have the spectator unlock the lock and open the box.
Inside they find another wooden box.
That box is removed and opened to reveal the spectator’s ring!
Very clever mechanical prop comes complete with instructions for several routines.