Pat,
I would follow LIs advice, get can or two of the expanding foam and fill every nook and cranny where a mouse can get in. Pay particular attention to pipe and wiring penatrations. Seal all paths in to the house. It took me a year and a half to find out where the mice were getting into my house, turns out a plumber drilled two 2 inch holes for two 1/2 inch pipes and left them unsealed. The builder then covered the holes with insulation. I sealed the holes up (along with others I found earlier) and haven't seen a mouse since.
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