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Moses

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  1. Truth in packaging

    As all three boxes were labelled incorrectly there will only be 2 ways of doing this. Say this is correct order 1. Nails 2. Nails and screws 3.screws No dearrangments will be 1.S 2.N 3.N&S And 1.N&S 2.S 3.N So we will get the actual arrangememt by doing either doing two swaps ( 1&2, 2&3) for dearrangement 1 or four swaps (1&2,2&3) again (1&2,2&3) for dearrangement 2. So after doing two swaps we can take an item from a box and check. If it turn outs to be the wrong one. Then make two swaps. And we will get the actual arrangememt.
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