I'm not ready to say yours is the first "house-broken" snake (for HIS house, not yours ) but I've seen many snakes defecating over the years & they do
appear to pay some attention to placement...a number of mine deliberately put their tails over their water bowls & leave it there, hoping it will flush, perhaps?
And often they line their tails up in the cage corner too, so??? Maybe they see us looking for "it" all the time and they're trying to help us find it by aiming for us?
"Look, I've got a present for your." Hahaha...we'll never know for sure?