Corner dings, right-edge wear, chips vs tears
Corners and the right edge take stacking damage. Missing paper is a piece defect; a soft blunt is not. Manufacturing chips are not graded like a torn bite of the same size — except at the very top of the ladder.

Corners
Shoot each of the four cover corners as its own close-up, tight enough to see blunt, crease, and color break. A softly rounded corner without a break is handling wear. A corner with a white pinch or a triangular loss is more serious. Bottom corners take box-bottom damage; top corners take shelf and stack hits. Do not send one “nice” corner and imply the others match.
A ding that only rounds the board, with ink intact, is not a chip. A chip is missing paper. A tear is a split that still has both sides of the paper present. Those three words get used interchangeably in ads. They should not be interchangeable in a grade.
Right-edge wear, chips vs tears
Right-edge wear from riffling or box storage shows as a line of small chips or a softened edge. Accumulation of those small hits can outweigh a single larger defect elsewhere. The right edge has to be in the full-cover shot; a cropped cover that hides it will not get the benefit of the doubt.
A tear that stays attached is not a missing piece, but a tear that lets a flap lift is on the way to detachment. Missing-piece size and location both matter. A tiny corner loss is not the same as a chunk out of a character or the title. As grades fall, larger triangular or square losses are tolerated: very small at very good, larger into good and fair, and extensive loss belongs with poor. Tape over a missing piece does not restore the paper.
Manufacturing vs handling
Bindery chips, tiny bindery tears, a printer crease that matches the print run, or a minor miswrap are manufacturing. Conservative grading treats those more leniently than a handling tear or chip of similar size — except at 9.8 and above, where almost no defect is shrugged off. If you know a mark is a printer defect, say so in the notes. If you are guessing, the estimate will still prefer the more serious plausible reading when the photos are ambiguous.
Chart estimate for raw condition only — not a professional certification.
Grade a book