Mouse hole

In my Gen 3 2012 Prius, I had a paper towel roll in the back, and one day, I noticed that a mouse had begun to make a nest out of it. The Prius is quite well sealed from the outside, but there is a plastic vent panel with small slots in it, I assume for ventilation. A mouse had managed to gnaw through it, just enough to squeeze through. I suppose that panel should have been made of metal. I cemented a metal mesh from a window over it, and that seemed to do the trick.