I was finishing up installing mouse guards yesterday. It was a warm day and the the bee's were active. They would come out in numbers at the sound of the staple gun at the front door. I found 2 colonies in 2 different yards that had just vanished. Both had small patches of brood. One was abit light on stores and the 2nd was loaded to the hilt on stores. The 2nd had 10 full frames in the top box and a crest of honey across the tops of all the bottom frames. Neither had any robbing going on. They had absolutely no bee's in them.