Need Help Big Time. Mice In the Camper. What Holes To Plug.

I am in a pickle. I am on an overlanding trip far away from home in my 5th gen 4Runnercamper build. A few days ago I discovered that something made it's way into my camper and started eating my bread, aside of leaving a trail of crap behind itself.

I sat patiently this night, and finally found out who the uninvited guest was. It was a mice. I read about preventative methods, peppermint oil, Bounce dryer sheets, etc. All that is good.

I need a permanent solution for while I travel. If this sucker gut in, then others will come. Where did it get in from? I know that it might have been the air ducts, but where? Anyone here knowledge enough to point me to the right place of potential entrance either through diagram or a photo?

My plan is:
- to buy a mouse trap. It is arriving today, and will be picked up from an Amazon locker near by.
- It seems to go for the bread, so I will place the bread in the trap.
- I will be leaving the bread out of the camper overnight in some sort of a container on top of the roof.
- I will buy either a container or a hardy food storage bag for the other food items that are not kept in the refrigerator.
- I tried tee tree oil in the camper. I had one on hand for other purpose. Its smell is so strong that it even gives me headache. It might be a good idea for storage but not for travel.

 

A mouse can get in a hole 1/4" in diameter so they're probably many places it can gain access to get in!!