Just an FYI: always keep any dry dog/cat food, seeds of any kind in a sealed container. Small lidded metal and/or locking lidded type plastic trash cans are a low cost way to keep from feeding rodents. I did the same thing about 30 yrs ago and had mice crawling in the walls of our rental house and shoveled about 5 lbs of mouse droppings from our garage. I thought my dog food was safe from rodents being it was in about a 3 ft tall plastic trash can. I didn't know they can craw up a metal or plastic can, no matter how tall it is. Also yla, keep an watch for more mice because they smell the scent from the previous mice. If you got time and effort, it would do good to use scented bleach or concentrated Lysol and spray and mop out your garage. That will get rid of the scent and visiting mice.