To be fair, If i'm Maxis, i will do the same to you too. You already bring back to home, no one know what you did to the phone. If you opened in front of the counter then different story. You choose to bring back home to open the seal, then you should bear the risk. If anythings can go back to them mean somethings like hardware failure, not some problem that can be cause by a soft hit on the edge.