Scrapes from Decor?

[Bogertophis]

Yeah I’ve never seen it this large! On all of my other snakes it’s pretty much invisible unless you’re looking.

Well I have. I've seen a huge (deeper) inverted crease on some larger (heavier bodied) snakes, one that went all their entire length. At the time, I suspected it meant they'd spent some time in a dehydrated condition, from which their scutes never filled back out from, but I'm not sure.