I just recently found a BP that i chalked up as either dead or thrown away by accident, as i have a huge garbage can next to the racks in the BP room. We found him in the basement by the hot water heater with a fresh shed right next to him , he was gone for two months. i ripped my house apart for 2 weeks until my sister said "why would they climb up when they would go down into rat holes and such they arnt very arboreal". minutes later we found him. It also happened with a Female Lesser we have she was gone for 6 Months. We found her on top of the porcelain toliet of all places. They will turn up , even as frustrating and as disappointing as it may feel.