I mentioned the feeding because when a snake is having to be ASSIST FED because it doesn't have a feeding response, then there is a PROBLEM. Yes? The snake is either bored, doesn't recognize the dead mice as a food source, or has other health problems such as internal parasites or the husbandry is off(which it is).

And live mice that are well fed are perfectly fine to leave in the enclosure for an hour, especially a small adult. I've left hoppers in with 65g babies overnight. No missing eyeballs(usually a missing mouse though). Mice and rats don't "attack". If they are stressed, they will defend themselves. Stick a piece of food in the enclosure if you're worried. I've yet to have a mouse take a chunk out of any of my snakes and none of my 45+ snakes are traumatized by me leaving a mouse overnight in their tubs.