I lost a late season swarm after last frost date, almost all bees gone, they took very little honey. I put some crawlers in a jar to see if I saw phoris (??) fly larva, I did not, the hive had had a heavy hive load after about 6 frames of late season brood hatched, I'd been in and done powdered sugar. Not sure if it was or was not CCD, think it was dumb queen wanted to swarm and dumb me saw all those bees in the air when on the way to work and said, no, surely not. A queen cell did hatch but the new queen got lost and did not return or took off. I distributed honey to existing hives as I haven't seen EFB lately.
There was only 10 day old brood by the time I opened the lid, the left behind might have been robbed by my stronger hives.
Our first freeze was november 7th and drones were kicked out. I discovered bees gone about the end of November, would have to look up date.