I had a problem with my first iMac and was told that once I ship back the first one, the second one would come. So I shipped the first one back and then got the second one. This second one had some defects too so I got another replacement ordered. But before I had a chance to send it back, I've already received the new replacement. So does this mean Apple screwed up and thinks I already sent the old one back? If so, can I get away with keeping both? Regardless of how unethical it is (I know it is, no need to point it out), I'd just like to know if it's possible that I could keep both machines without any repercussions.