I have a friend who let a beekeeper place 4 hives next to his cotton field several years ago. The beekeeper left the hives and eventually all the hives were empty. This spring I noticed a few bees going in and out of one of them. Now it looks like the hive is thriving. The beeekeer used two medium supers with a queen excluder followed with two more mediums. Friend said the beekeeper did not want the old hives so he said I could get the bees. Any suggestions on how to do this?