A few weeks ago we thought we had lost our bp. The tank was securely closed so we couldn't figure out how she got out so we started searching my son's room, praying that she didn't get out of his room because my father is terrified of snakes, not to mention the three dogs. My son is 13 so his room is not the cleanest and searching wasn't easy but we cleaned the room as we searched...might as well kill two birds with one stone, right? About a half hour into it, I asked my son if he looked under the water dish because she has hid under it before. He said that there was no evidence of her digging under the the water dish and didn't feel a need to look. You never know so I made him look under the water dish and fortunately she managed to sneak under it without leaving a trace. Unfortunately though 1/2 hour wasn't long enough to clean his room!
I hope that you find your snake safe and sound somewhere very, very soon! Please keep us posted.