My first BP years ago was a wild import. She was not interested in mice or rats, but I was able to get her on rats by asking the pet store to throw some soiled gerbil bedding in the box with the rat. By the time you get it home, it has picked up some gerbil scent. Have yor tried putting a pre killed rodent in a paper bag along with your BP and then placing the bag in the enclosure at around 7 PM and leaving overnight? It almost always works.