The real question is, how can you tell if something's in a box, if you have no way of looking into the box? And no, you can't shake it.
English
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Edited by Abe Lackman: 6/7/2013 9:13:00 AM1. Take empty box of equal size to the box in question 2. Weigh empty box 3. Weigh the box in question 4. If the box in question weighs more than the empty box there is something inside it 5. ??? 6. Profit
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Sniff it.