Are your temps/humidity right? No signs of any disease on him? As long as he's not losing weight, I wouldn't worry. If you really want him to eat, sometimes making the mouse really warm will entice him. I have a heat lamp that i'll put the mouse under to make it warm if my bp's not showing interest and he will usually take it after that.
Sometimes you can even irritate your bp with the mouse and he'll get mad and strike. Kinda rare for that to happen, they usually just hide their face, but it's worth a try.
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