My sister installed a package. Four Days later they swarmed. They had even began to draw out comb . She caught them and put them back in a box. I said seal them up for a couple days and feed them. Was I correct? I had never heard of such a thing. I said maybe the Queen wasn't mated. Maybe these package of bees had been shuck out of a hive that was in the process of swarming. Any opinions?