While hilarious, I'm going to continue my notion he was the the last one....Back in November, before I sealed all outer vents except the one associated with the stove, I had my due yearly influx....No mistaking when that happens......
But I'm going to blindly think this one guy just couldn't return to the defunct nest because I killed the only way in and out.....Well not only, my central heat and air vents are sill open but I've never seen a mouse take a 14 foot free fall and without contemplating the logistics of that, I'm confident that's not how they got in.
That said, I hadn't seen any evidence of one for several months until I had to throw ot a 24 pack of ramen a few weeks ago.....Let me have this. I took care of the problem.