Robo {I have inspected a few of these late season vanishings and they seem to have scattered capped brood left. After digging out the pupa I found a large amount with deformed wings. Interestingly enough, there were not any significant amount of varroa on the bottom boards.}
Exactly what happened to an extremely large hive, late August, 2017 in my Apiary.
The details: the bes just vanished, left behind capped Honey, no eggs, no larva, a few cells of capped brood. The hive did show signs of deformed wing virus, one of two positive hives for virus out of total 18 hives. I immediately treated the empty hive with OA vapor, hundred plus mite drop from the EMPTY hive.
This hive was a 2 year old double deep Lang. hive 80% capacity with bees and had several frames of capped Honey which most was taken when the bees departed. Apparently, do to the fact there were no eggs, no larva, this was a planned abscond as the queen quit laying in advance of departure. I was planning on treating this hive in another 2 weeks, obliviously I was to late.