Help, ball python not striking at food

[Bogertophis]

I waited somere and my BP finally noticed and ate the mouse, he was so desperate to eat that he successfully ate it back first. By grey inside i mean like.. What the mouse looks internally. To explain better, i got a mouse that was furless on a big part of its belly, it was squishy and had that funky smell like all the other mice did, but since the skin was so thin i could see right through it and saw a dark grey color. I often times saw that with the other mice too though, just not that clearly,i just wanted to know if it was normal.

No, not normal. Sounds like your rodents are spoiled, & that's likely why your snake hasn't wanted to eat them. Please find a better source for rodents, that's totally unacceptable. Ugh!