I'm trying to get a good look at that bottom staple. Seems bent? Discolored? The other area I can't make out clearly is the top of the back cover. Appears to be wavy? So I'm curious about that.
If that is a stain on back cover, you could get dinged all the way to a 6.5, as grades beginning with 7.0 say "no obvious soiling, staining...except for minor foxing." I've seen multiple books get graded at 8.5, etc., with notes of stains, but those stains are virtually imperceptible.
That would be sad, as it otherwise presents as a 9.2.