I returned my iPhone 4 last week and they refunded me $250 with the rest coming in by check. Now, I lost the return receipt they gave me and I am worried what would happen if I never received this check. I still have the original purchase receipt of the iPhone and was wondering if they could check the serial number from that or do something. I paid by cash in the first place. I also gave the store I returned the iPhone to my name and address to send the check to so would this help?