If you wanted to do some experimenting you could play some really loud rap music night and day. Get one of those silly car shaking woofers and sit it on a half buried garbage can so you direct the sound into the ground. Probably after a few hours you will find their exhausted little bodies scattered about. Possibly with a few neighborhood kids as well.
After trying hidious traps and tracking paths using a spinning magnet on a sewer auger tip. My wife used the juicy fruit gum pack of five partially opened ( using surgical gloves ) and placing them down active holes no more then three times a day or two apart.
I had a gopher problem last summer. I used some of the gopher smoke bombs and bombed every hole I could find. A few days later, they had all packed up and moved to my neighbors yard. Problem solved. lol
Basic locksmithing principle: You don't need perfect security, you just need security good enough that the crook goes and bothers someone else. Which is a lot cheaper.
A cat that is a good hunter would solve the problem. And probably love you for helping it to fulfill its hearts desire which is to kill things smaller than itself.
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The gum causes death by gastroenteritis.
Problem solved. lol