> Those open holes are where your mice were getting in.  Somebody must have
> removed the plugs for some reason...
>
> The only other possibility is the battery box vents but that only lets them
> into the battery boxes.

Hey, Bob:

How long does it take those Moab/Fruita mice to get into our stock
'87 Westies?  Ninety seconds?  There must be other possibilites.

http://jones.colorado.edu/jones/Fruita06/pix/HonourThyMice.jpg

Richard