Loose super tiny corn in basement - HELP!

i to lost my new corn snake last year, i have a two story house with a basement. the snake was kept on the second floor, an hour after i look at it one night it was gone. i tore the second floor a part not thinking it would go down stairs. what i did was put pinkys in a cotainer with a small opening with air holes in it, heat lamps in a corner of two rooms up stairs and use the powder going across the doorways, you will be able to notice if it goes thru it. also used plastic bags under empty water bottles with the pinkies so if it ate i would here it going over them. well all was for not because i found it in the basement. it headed right down the steps cause an hour after i check on it i did all that. those suckers move quick. just keep looking they can survive for a while... don't give up.:)