man, we have an enclosed backporch. and my wife was cleaning up back there cuz it had a weird smell, and she said she found a pet cemetary of dead mice back there
I'm glad I wasn't home when that went down so I didn't have to see it or clean it up.
however, he's a good cat. he's totally declawed and can still effectively catch mice with ease.
as for inside the house, I haven't seen a mouse inside or in my basement in like a year (his litter and food are in the basement).
when we first got him last year, we saw him playing with a mouse he caught in the basement. like he was smacking it around with his paws while it was hurt, and then would pounce on it. we had it on video, but I cannot find it anymore.