I recently installed six new packages. I have my hives setup with a single deep, a queen excluder, a top entrance spacer and a top feeder. When I went back after 3 days to be sure the queens were released, on one hive when I lifted the feeder off there was a queen in with the hoard of bees that were crowded into the center of the feeder. She seemed a little larger (definately a queen and not a drone) than the queen that was in the cage and was not marked (I looked at each queen through the cage when I installed the packages to verify they were alive and all were marked). Unfortunately she took off before I could catch her. My question is: Did I just lose my queen? For this to have been the queen I installed, she would have to of been able to get past the queen excluder and lost her marking as well. Is that a possibility or is it more likely that this was a feral queen attempting to "take over" (I do live in an area where AHB's have been found)? It has been nearly a week since this occurred and this hive still seems happy, they are busy drawing comb and acting the same as the other 5 hives.