If you hadn't said F/T I would have bet a hundred bucks those were rat bites just because of the pattern of them. LOL.
I had a buddy who used to keep his snakes in square glass terrariums with a round water bowl in the corner. I say used to, because he stopped after he realized some of the bigger / more adventurous snakes would get into the corner, get partially trapped, and pinch themselves with the ceramic against the glass. I never actually saw the injuries on them, so I can't really say, but I figured it was worth mentioning. As others have said, a lot of hides that are smooth on the outside are still rough on the inside. I have had to doctor some that I've purchased online, and I have had to throw some away too.