Congrats. The grade 6 I got from the last deal was heavily used, scuffed, and had two cracks in the plastic by the bottom corners of the screen, despite none of these flaws being listed. Considering how happy most people are I chalk it up to some sort of error... I don't think a Kindle with cracks would ever intentionally be graded as a 6. They're sending me a replacement... I hope I'm as lucky as you the second time around.
Darn... I went back and checked >.< I have one with the tiny tiny hairline cracks at the bottom of the screens in the corners. Ah well, hardly noticeable, and the screen is still pristine. Thanks for the heads up though. I missed that one. Good luck on the new one!