Mouse problem in 2017 RAM 1500 bed W/Tonneau cover

[COTTERSAY]

Oddly, we've never had a problem with mice invading our RAM's engine or cab compartments, but we have a big problem with them finding a way in to the RAM's bed, which is where we keep all of our tools and supplies.
The Tonneau has only paper thin gaps, there is a full bed liner in place, and I filled up the two square holes in the back-top of the truck bed with construction foam. Any idea how these little boogers are still getting in???

 

[Jeepwalker]

Is there a gap at the edges of the tailgate when closed? I applied some gorilla tap to the outside corners of my box at the bottom b/c I thought they could get in that way. No mice so far. And you can't really tell as it matches the color of the spray in bedliner. Just a thought.

 

[COTTERSAY]

Is there a gap at the edges of the tailgate when closed? I applied some gorilla tap to the outside corners of my box at the bottom b/c I thought they could get in that way. No mice so far. And you can't really tell as it matches the color of the spray in bedliner. Just a thought.

Sounds like a great idea!! I'll try it!