It's a single staple book, so detached staple would result in a completely detached cover and a much lower grade, so i'm guessing staple is intact. If there are stains (difficult to see from pics and lighting), then those would be relatively harshly graded by CGC, although I see no obvious staining here. Unseen Interior defects could of course contribute to a lower grade, but i'm guessing that would have been in the description since he was the original submitter. From what i can see of the exterior presentation, i would estimate a 6.5 even with the chip.
I think we just hijacked the thread into the PGM forum