There has been no mouse activity in any of the traps for at least 30 hours. Therefore, they're out of the house now, right?
I grabbed some steel wool from the garage to seal up the space around the pipe under the sink--recommended in various places. Sure, there's already some there on the *top* side of the pipe, so I'm guessing that there used to be some on the *bottom* side, too, but is no longer for whatever reason.
I empty that half of the sink cabinet--really not much there--liquid and dishwasher detergent, a small bucket, a couple of water filter refills, a container of extra sponges--don't bother pulling the neatly organized wire storage drawer out of the other half because it's not in my way-- and I crawl under with my flashlight so I can see what I'm doing. Cram that steel wool into that hole. Hercules Mouse himself could not get that steel wool out of there, I am so brutal at cramming it in there.
I decide to leave one of the traps that's still there at the back of the cabinet; what the heck, who knows, maybe in the future it'll be an early warning system if somehow I get another mouse invasion. I put back the water filter refills, the small bucket, the detergents, the basket of sponges. I close the cabinet door. I put the flashlight away on its shelf and turn to the refrigerator and reach for the door handle--and the mousetrap goes off.
What, did I leave something unbalanced under there? Did I nudge it while I was there and somehow destabilize it? A quick glance--nope, there's a mouse in it. So the big question is--where was the mouse while I was cramming steel wool into its escape route? And does he have more friends in the same place(s)?