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Display the wooden box and borrow a dollar bill (or any small object) and then place the box and bill behind your back for a few seconds.
Now the bill is inside the box, just that quick!
The spectator may examine the box & will not find the secret.
Again place the box behind your back & in an instant, the bill is free from the box and the box may again be examined.
This effect can just as easily be performed under a handkerchief in front of the spectators.