I just got this black iPhone 5 out of the box. I noticed this odd white mark on the inner edge of the nano-SIM card slot that I can't explain. This is NOT the water damage indicator. The mark is white and is visible ONLY after the nano-SIM tray is removed. It is ON the aluminum chassis, as if part of that chassis was not properly anodized. IMPORTANT: This mark is on the underside of the inner chassis around the SIM slot. That is, it is ON the FRONT (not back) part of the chassis. When looking, you have to look inside and toward the front of the phone. Can someone tell me if their black iPhone 5 has this too? Is this a scuff mark? It looks too uniform to be that. You will need to look carefully to find it. Please post your replies here.