Earlier when I was cleaning my iPhone I noticed a very slight dent in the back cover. You have to hold it at the right angle to pick it up. I've had my phone since November and have always kept it in a case and it's never been dropped. Is it possible it could have come out of the factory with this damage? I've set up an online return under accidental damage (no Apple stores nearby), what are my chances of getting it repaired/replaced?