This is advice given on another forum on how to find a lost BP. Unbelievable!!!!

to catch your snake listen carfully. Tie a string tightly to a dead feeder mouse and the other end to a stick or post and run it into the ground, then put a box over it with an entrance. Leave it overnight and check it the next morning, youll catch it if its outside. This will not harm your snake just cut the string and it will be digested with the mouse.