Only eaten about 3 times in 5 months

[Bogertophis]

Update: Got two fuzzy mice and one fuzzy rat. Offered mouse first, went after it. Offered second mouse, took immediately. I then offered the fuzzy rat (which was on the small side, maybe 10g) and the snake did something peculiar. The fuzzy rat wasn't moving much and the snake kept sliding its head over it. Finally, instead of striking and wrapping it, the snake started to swallow it, still alive. The tail was still moving as he finished it...

BTW, that's not such a strange thing at all. Once snakes learn that fuzzy rodents are basically helpless, many don't bother to kill them first*, they just do what yours did- swallow them. *They're also rather small to try to constrict- but mostly snakes seem to realize they pose no danger.