We should make more of an effort to keep the mice out of the garage and house. We first need look around to identify entry points. I know they get in at the garage doors, the gap between the garage walls and floor, and the vent below the garage floor. We could put a trim piece between the garage walls and floor to keep them from getting in at that gap.
As part of the data collection phase we need to identify these entry points and for the design/planning phase we need to decide how to seal up these points.