If you have other pets, pay attention to what they are doing.
Found my kingsnake after a couple of months on the prowl...he was in the laundry room. None of the traps worked for me, and flour made no difference for tracking him. But my dogs found him and started barking. If you have other pets, pay attention to what they are doing. Is you cat watching under your fridge? Is you dog barking for no reason, go and look!