I didn't think explosives were the best option - for now. But I did buy some peppermint oil. Holy crap, that stuff's $30 an ounce! I also replaced my bait with peanut butter as per several suggestions.
However, I haven't seen my furry friend for two days now. He has either died behind my filing cabinet, or he's figured out there isn't anything to eat in here and split of his own accord. The problem may have solved itself.
But my studio/office smells nice and minty now.