Are you kidding me? This has to be some kind of joke, right? I just can't believe that people would be so petty and anal about a cosmetic issue. Who in their right mind would return a fully functioning ip4 knowing they could receive a defective one all for a few scratches? No one that doesn't deserve to be in a white jacket in a padded cell, that's who.
If you're going to be that psychotic about the cosmetic condition of your phone then you should probably get a grasp on reality. The point of the phone is to function, not to look flawless all the time. On top of that, the bumper has never been promoted as a protective case, so it shouldn't be treated as such.
There are people who would die to have an ip4 yet you cry about such a minescule problem. I hope all your future phones are nothing but problematic. Your selfishness and petty attitude warrant nothing less.