I think I know the answer to this but asking on behalf of my cousin. Does Apple record the serial number to your shipping invoice? He was planning on returning his TMob X but he ended up damaging the phone beyond repair. He bought the phone from Apple website on launch day. Can I give him my new X that I got from TMob (same model/color) for him to return the phone and get his cash back? He will pay me back monthly for his phone but I guess he can't afford to take a $1K cash hit right now. TIA