Hi friendI just wanted to add one thing. My only advice is to keep trying, feed him at night, and make sure those mice are hot! I personally let the mouse thaw for two hours on the top of Fírnen's cage so that he can smell it and his hunting instincts kick in. Then I dip it in hot hot water for about 30 seconds, blast it's head with a hairdryer for another 30 seconds, and offer it immediately.
As I'm offering it, I hold it by the middle with it's head facing Fírnen's head, and I sort of move it from side to side to get him interested. He usually strikes by then. If not, I reheat and try again until he either takes it or shows me that he doesn't want it.
Just wanted to share my technique so that you would have something to compare yours to.. Good luck!