Snake on the loose

[Jpham33]

So stupid me didn't close the enclosure all the way and one of my guys got out. Woke up the next morning to an empty enclosure and had a heartattack.

I've checked all over the basement and haven't seen any sign of it at all. The steps i've taken are:
- flour along the walls and anywhere I think he could hide
- water bowls along the walls
- enclosure on the floor just incase he wanted heat
- last night put a mouse out in the enclosure in hopes he would smell it and stay in the enclosure for heat

He's been gone since last weekend and i've literally haven't seen any sign of him at all, checking everyday in all the corners. Now i've only been putting most of my effort in the basement ( thats where the enclosure is) hoping he hasn't gotten upstairs even though it is a possibility.

Sorry for the long post but anything else I can do to find him? Tips and tricks?

I do understand that snakes are hardy and shouldn't be too too worried but it's hard not to. Thanks