Did a search and no recent threads..... We bought the TT late last fall. Didn't really spend much time putting her away properly. I'm guessing the powercord is most likely where they got in, but ...
When I lived on the farm the most effective trap was two wood base snap traps with long edges parallel and next to each other with the outer long edges raised so that the two traps formed a shallow "V". Even those little nibblers that might evade the snapping bail of one trap were readily dispatched by the second one.