Empty out all the drawers. Yes, EMPTY it out.
We had our bp lost for, I think it was 2 days, and we finally found him inside a drawer underneath all the paper. We never thought he could fit in the crack behind the drawer to even get in there! We checked all the drawers, of course, just shuffling papers around to see if she's hiding there. We never saw her - she was all the way to the back underneath all the paper. We finally found her when we emptied all the drawers.