Well there are a bunch of useful threads usually once a month at LEAST...the best thing I have found if it is known to be in one room and that room only then think of a snake as it is instinctual..it is in a place where it is warm and confining. My wife left a tub pulled out of our male pastel once..yeah once and never again i assure you LOL. Anyways he didnt even leav the rack he was two leves down wedged between a tub and the rack.
Other unique places....
Printers
Drawers
Vents
Any kind of box
Shoes
Once definitly you looked and coannot find leave out food on something that will make noise when snake goes to eat it...a gerbil is very nice bait but you run the risk of him actually eating it and getting hooked on him but better that than gone.Remember also snakes move horizaltly first than vertically try and figure out the path that he could have took and start there
Good luck
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0.1 Leos
1.1 Corn snakes (1 Lav & 1 Ghost)
0.1 Banan California King
0.0.1 Childrens python
1.1 Brazilian Rainbow boa
1.0 Rat (as pet not food)
1.2 Ball pythons (1pastel 2 normals)