I'm glad I found this post as we were wondering the same thing.

We fed our BP a small mouse, then 5 days later a smallish rat (he let us know that he was hungry again). One week later (last night) I found a poop in the corner of his enclosure. Let's just say that it was a surprise to find something the size of what our cat leaves in the litterbox. LOL

Haku was a bit cranky 2 days prior to relieving himself. He'd left a few urates and some urine between/after feedings, but I guess he finished digesting everything. Oddly, he rearranged his enclosure a bit prior to pooping. We have 2 hides in there - 1 over the heat tape and 1 in a cool spot. He'd moved the hide over the cool spot, had moved around a lot of the cypress mulch, and was hanging out in the enclosure as far away from where he'd pooped as possible.

We're wondering if he's a clean freak or something.