I had a BP climb into a couch one time, because my lady isnt very fond of snakes I couldnt wait over night to let him come out on his own. I had to rip the couch to pieces and even then I though I would never find him. He managed to coil himself around one of the springs in the couch. Took me a long time to get him out but he was fine. The couch, not so much.

Good luck getting him out.