You will be surprised where they turn up! Good news is is that apparently you were housing him in the basement, so I would almost say that your chances of him still being there is 98% or better. Do you have a water heater down there? also, if you have any reclining chairs or couches, check up inside of them. (I wouldnt sit down anywhere) Recliners are typically hollow on the inside and with all the mechanisms it is a good hiding space for the lil guy to hide.
Best of luck! and like what was said before, if you have hard wood floors, put some flour down around the edges of the wall and especially across doorway threshholds to see if it was passing bye that area. Even if you dont find him with this tactic right away...at least you know hes around!
Reply With Quote