Strange poop in burm enclosure

Hey everyone,

Just went to clean the burm's cage today cause I noticed he had pooped, and I found some really strange poop/tissue in the corner. The burm had pooped normally, but a few inches away there was some pale mashed up tissue about the size of a marble, with some fur and part of a tail.

It's been about 4 days since he ate last, and this just came about this morning. I'm hesitant to call it a regurge because he ate normally, and seemed to have been digesting fine as seen by his recent poop. Have any of you experienced this before?

Ive never had a regurge in 20+ years of owning snakes.

Without pictures it's hard to tell, but sometimes undigested bits of bone and fur can come out with the feces.

ETA: If it didn't smell "run you out of the house before you throw up" bad then it's probably feces and not regurge.

It definitely didn't smell good, but it wasn't that bad. I think it was just a bit of non digested material.