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I had the same problem with mice in our house. Couldn't figure out where they were coming from until I laid out traps in the rooms downstairs and blocked each doorway to keep them from going into other areas. Once I determined which room they were getting in through, I crawled all around the room with a flashlight and a screwdriver. They were getting in through the garage and underneath the dividing wall of that room. The floor had settled enough to give a small gap for the mice to come in through.
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