I once had mice get into the backside of a bag of grass seed. I never saw it and didn't know anything was going on in my garage until I was infested! I remember sitting in the garage quietly noodling on a small engine problem when I heard something. Then out of the corner of my eye I saw movement. So I stayed still and watched for a while to figure out where they were going and what they were up to. Then I grabbed my sons bb gun and sat there and shot mouse after mouse for over an hour! I had a blast and killed quite a few of them. Just a thought for you. Got a young son who might like "the hunt"? That's is what it reminded me of. I was stalking and quitely moving around for better shots.