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OK, I'll bite.Mouse doesn't really do much damage, but if you have rat's nest there, you've got a real problem. Ask me how I know.
I had a mouse nest in my 2004 Accord right behind the cabin air filter located in the usual place, behind the drop-down glove box. Pulled the filter, "what's all this"?
Under the category of TMI, Terminix claims mice can squeeze through openings as small as 1/4" so the possibilities are nearly endless.
House Mouse - Mouse Hole Characteristics | Terminix