Get some soiled mouse bedding, or rat bedding if he was fed rats up till now. Pull the frozen mouse out a few hours before your going to feed and put it in the soiled bedding and put that near the BP's enclosure. Some people even put that into cups (lids on of course) with holes and put it right into the BP's enclosure.

That is prescenting. Gets the snake in the mood for food and hunting.

Next, about a half an hour before your going to offer (around 8:30 at night usually) pull the mouse and bedding. Put the mouse into a ziplock bag and put it into very hot tap water to finish thawing and warm up. Leave it there for 15 minutes or so.

Pull mousy out of the bag, put the mouse head up to a light bulb for a minute to get the head warm so the BP can "see" the heat and strike.

Grab the mouse with long tongs, do the zombie dance with the mouse (Dangling and flinching the mouse in the enclosure) and hopefully he will strike.

If after a few minutes he doesn't, reheat the mouse head again and offer one more time. If he still doesnt strike, warm up one more time and leave the mouse in the enclosure over night. Leave the BP alone in a quiet dark room.

Hopefully the mouse is gone by the next morning! If not, wait a week and try again.