Check the laundry room as well as the fridge area. I've heard of snakes crawling between, behind, and into washer and dryer appliances through open workings. I would do the same to the washer and dryer as was suggested for the fridge, and pull them out and look behind/inside. Also pull up couch cushions if you haven't already, and search any dark, tight and/or cluttered spaces.
Definitely try the flour trick and put lines of flour throughout the house. The more lines then better imo, you never know where he might be, and the more lines that are disturbed the better an idea you have of his direction of movement.
Good luck finding the little guy. How did he escape, if I might ask?
EDIT: The flour trick will only work well if everyone in the house knows about and tries not to disturb the flour lines. I don't know if you're friend has housemates or free-roam animals like indoor cats or dogs but if so the flour might not be the best idea.
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