When my bull-snake got loose, the only place I didn't search was where she actually was holed up...and that's because it would have meant ripping out the cupboards to see or reach her. I was worried sick
about her & kept hoping she'd come out much sooner than she did. (but at least she was fine, just hibernated) They don't always go as far as we think...they feel exposed & nervous out in the open. Good luck!