Good to know about the peppermint oil, I'll keep that in mind.
Here in KY the mice like to come in around the fall when the temps start dropping, but once they've established themselves they stay. When we first built this house they came in under the garage door. (Hah! Guess what! My trap just went off and got the little peanut stealing varmint. He got a half dozen but just got too greedy and slam! Down came the door.)
Anyway, the mice carried dog food from the 50 lb. bag into my bass boat, which I found in a rod box during a trip. I got a box of D-Con and put out a trap. It was gobbled up in a day. Put out another one and that lasted most of the winter. Several years later and the traps last about 2 or 3 seasons.
I store the AS in a commercial lot so I'll check into the peppermint oil as a deterrent but I'll keep some D-Con around too.