Great pictures, John. I'm noticing 3 things. 1) Is that big white fuzzy spot mold? If so, that indicates to me this hive has been dead for a while. 2) I'm definitely seeing some varroa frass in the brood cells. It's always hard to tell on pictures how much exactly is there, with the variable focus of the camera, but definitely some varroa pressure in this hive. 3) That queen cell in the middle of that honey/pollen frame seems weird to me. That queen cell may be older, since they've backfilled the nest around it. Actual question: Have your bees been foraging over the winter at all? Probably unanswerable questions: It looks like they attempted to raise a queen at some point, but the question is when and why? When did they construct that queen cell, and was it ever capped? Was it a late supersedure and the new queen didn't mate well? If so, why did they attempt a supersedure? Was the previous queen of poor quality, or were they under some sort of stress that they attempted to fix by rearing a new queen? Based on the lack of bees in the hive, it doesn't seem like it was starvation or cold-related, so my guess would be it was either some sort of queen issue, varroa issue, or perhaps a combination of both. Hopefully others will offer their opinions as well.
You may want to start a new thread about evaluating the deadout, John, just because many people may not see the conversation under this thread title.