To add more of the pieces to my puzzle I can say of this hive that there were a few dead bees on the bottom board,not a lot.No swarm or supercedure cells. The queen was newly installed(SMR) 27 days ago. Also I noticed a few houseflys and about 10-15 yellowjackets inside.I had 2 full frames of capped honey three weeks ago,now that is all gone and it has about 1 and1/2 frames of uncured honey in it at the present.Very few eggs or larva and about one frame total(in a tight group) of capped brood that had no perforations. There are no piles of dead bees in or near the hive,and no major storms recently.It would seem that the answer would be that a swarm has emerged,since the queen was not marked this could be a possibility,but why are there no queen cells in the colony?Did a sugar roll and not one mite could be found.SHB is not a problem here.No ants either.Not sure of pesticides being applied recently within one mile. I did notice quite a population of dragonflies flying about as this is near a large pond.I thank you all for your help in trying to resolve this. I have restricted the bottom opening to a minimum and will feed summer syrup and another grease patty in hopes of rejuvinating the colony.