I had an escape-prone snake a while back. Found the sucker in my laundry basket most times...near as I can figure he was aiming for a scent he recognised (aka me) and associated with warmth...the one time he got loose and was found almost immediately was rather funny. He got loose at night...aparently got cold outside his tank (this was years ago, long before I switched to tubs) and I awoke with him curled up around my neck for warmth.
Best of luck finding your lost BP...definitely try the flour-on-floors unless you have carpet.