There was a petstore around here that recently closed but they were having wild mice come in and burrow into the bags of bedding, rodent chow, and chewing holes in the plastic rodent containers. They really can be a mess. I would like they said call an exterminator. Is there any way you can get any pictures of the areas where your finding them? We had rats coming through under the garage door, through a floor drain in the basement and you'll even see wild mice trying to get under the windows sometimes.