Back when I trusted the sliding-top screen mechanism, one of mine escaped. The flour on the floor trick worked pretty well, but what everyone is suggesting here is golden. A live mouse in a tank with some warmth would be great. I happened to feel my little one brush against my toes under the bed while I was folding laundry.
If you also use a sliding-top screen lid, make sure you shove something in the lock hole, whether a lock, a stick, etc. if you leave it unsecured they will push themselves out. Good luck.
This is good to know about the sliding top lids. Cause i honestly never thought bout that.