A few years ago. I had the mice pull insulation out of my workshop & move it 50' to the new truck. There they plugged up the blower fan with insulation & built a large nest of sticks & insulation on top of the engine. It took quite abit of work to clean out the insulation from the duct work & to remove the big nest in the engine compartment, not to mention to repair the wiring damage of what the chewed on under the hood! I had to come up with a new parking place on the property to stop them from rebuilding.
They still show up in the shop & under the house from time to time. Poison baits they just stock pile, so metal professional traps keep them out for a while.