I'm no expert, but I think that any time prey is excreted partially digested it means there is a problem. Most likely the temps in his environment are too low, preventing proper digestion. There could possibly be a bacterial infection, parasites, or something else. The pooing that you describe sounds like diarrhea to me. It sounds like he had no control over his bowels because it's pretty unnatural for any animal to cover an entire area with excrements. Anyway, I would get him to a vet for a checkup right away if I were you. Good luck!
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