That's why rebates require that you cut the UPC off the packaging or send an original receipt. You can try for secondary rebates which only need photocopies because they know you'll need the originals for the primary rebate, but those rebates are smaller, harder to find, and may even link up to the purchasing store when you go for your return (I think compusa does this with their in-house rebates). This scam isn't easily repeatable either since you have to give them a mailing address to send your rebate and a name to make the check out to.