If there was one mouse inside, there are probably more. I worked briefly for a pest control company. The strategy in mouse control in a stick and brick house is to identify and seal points of entry, place baited traps inside to cull the remaining mice in the house then place rodentcide in pet/child-safe bait stations outside. We used copper mesh and a brick mortar repair compound to seal holes you could stick your finger thru. Larger holes were sealed with galvanized flashing.
I'll add from my own experience that despite removing all food from my TT, I had mice in the camper more than once. It's not only food they are after, it's shelter.