There were multiple dents on the back. You can see the dents at a glance without holding the item up to the light. I am buying an item that says "A: No significant scratches. Are you sure there are no scratches? Are you expecting to be asked questions such as "Are you sure there are no scratches?
One of the four A sheets had a scratch on the back side that was probably caused by a staple needle that had popped out of the sheet.
One side was rounded off, but the other side had the needle slightly facing up, so I think the scratch was caused by rubbing.
The needle was in the same position as the scratches on the sleeve.
It is a little disappointing, but considering the price, I think it is a compromise.