Scanning this thread, I didn't catch a mention of the fact that snakes loose in a house often head for warmth -- so under the fridge or other appliances that generate heat are good places to carefully look. One of my adult rainbow boas escaped a couple years ago (slid the glass AP cage door open -- locks on them now) and just curled up under a snake rack.
My most memorable colubrid escape was a just purchased micropholis hatchling that slipped the cage and crawled into the attached garage that butts up against the basement reptile room. He somehow got into an empty 5 gallon bucket and wasn't quite large enough to get out, so he was recaptured and to this day I don't give him any chance to repeat the trick.
Anyway, it sounds like you've got a lot of good plans in place for locating him -- I think you'll find him.
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