Krome -
the first person puts the thing in the box and puts lock 1 on.
person 2 gets the box, puts on lock 2 and sends back to person 1
person 1 gets the box again and removes lock 1 then sends back again.
person 2 gets box for the second time but it now only has lock 2 on it which he put on himself. He then can open the box.
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