From my own person point-of-view and from a person who used to build his own computer, the outside of a computer doesn't matter to me one bit. Heck, I once ran a computer that I was building on a test bench for about 6 months before I decided to put it in a case. Now if there was a big old scratch on the screen or the computer gave the blue screen of death (something that I have never seen with my iMac 😀 ). Now, back on topic to your scratch(es). Honestly, I think an Apple representative is probably going to scratch his or her head (no pun intended) with that scratch though maybe the photo isn't doing it justice?