Just went through the interior--front to back. Found no nest--no poop--no light coming in from outside. No indication, at all, of mice present.
Don't think they can get in through the electrical cord--opening is no more than 1/10th of an inch. Furnace vents screened off. Locked all outside bins, although they aren't that secure.
As I'm writing this, I just thought I saw a blur out of the corner of my eye.
Doesn't look good if I'm right.
BTW--I've been on the road for 11 weeks.