Hi, I bought a mac pro and an iPod on the same order and am intending to get the $180 rebate on the iPod once the Mac Pro ships. Apple says that it's fine if they ship separately as long as both of the receipts have the same order number on them. What does Apple consider to be "the receipt"? Is this the packing slip (which I can't find any evidence of a web order number on), or is it something I've already thrown out in my carelessness? Please help!