Weird Brooks Kingsnake Poop?

[Bogertophis]

-How do you know he's 3 years old? Have you had him since a hatchling, or is this what you were told?

-What are the temps (highest & lowest) in his cage? how is it heated? size & type enclosure? how is the heat regulated?

-Bear in mind I'm not seeing the snake either...I have no way of knowing if he's over-fed, under-fed or showing other signs of illness...more info needed!

-How often are you feeding him? AND since you mentioned his history of eating issues, it really might be time for a vet check along with a stool sample.

-Is it possible that he isn't warm enough to digest food, or that he senses (from the chill in the room) that he needs to brumate???

-when you feed him, I recommend that (if he doesn't take food from tongs, or if he lays it down after taking it) feed him on a "plate" of some kind.
it can be a paper plate or a plastic one, even a box lid...but you need to make sure that his substrate (paper towels) do not stick to his damp rodent, thereby getting
swallowed. Snakes have great digestion, but cannot digest things like wood chips, paper, cloth; it's possible that such things can cause internal blockage if accidentally
consumed. You can see the "weird poop" much better than I can online...it may well be fur & bones, but I noticed the paper towels & it's easy for a snake to ingest
a little substrate if you're not careful about how you feed them.

-snakes take varying amounts of time to shed...if you feed him during a shed (& he takes it) it will slow things down greatly. Recommend against food while in shed.

-the older a snake gets, the less often he sheds. 3 years old is fairly young...shedding only twice a year seems a little "off" for his age, if correct.

-the quote below may or may not be a significant feeding issue; this is the way a snake typically behaves when they're somewhere along in their shed cycle & don't
REALLY WANT to eat. I hope you are keeping a feeding record on him (w/ relevant observations)...should you need a vet's help, it would really be helpful.

...."an example would be striking, constricting for an hour, and then letting go and acting like the food isn't even there, but he would always end up eating if I kept on wiggling the rodent, eventually."