Farmgirl, you are my new hero with all your amazing advice!
Also, to the original poster, My last snake went missing before, a few times actually, and we always found him in between the matress and box spring, Maybe.....set out a plastic container with mice in it that the snake cannot get into, maybe if he is still around he will smell them and come looking for food.
Also.....Check your refrigerator, stove, water heater area, any place like that that they can get up inside that is warm is a perfect hideaway for a snake. might I also suggest, keeping things super quiet, that way if he is around, moving anywhere, you might hear him.
I wish you luck!!!
Let us know if you find him!