I decided to up date my last post. I've caught seven swarms this year with five boxes out. I just saturated one end of Q Tip with lemon grass oil and put in the box. I'd put a drop at the entrance a couple of drops on top just to attract the bees. It has worked like a charm. The real trick is to put the boxes where the bees are. I had two of the boxes up on my land for two weeks and never saw a bee. I moved them where people were seeing bees and started catching them. Dissolve some sugar in warm water and pour it in a container with rocks in the bottom. If you don't see a bee in an hour, don't put up a box.
I'm not claiming to be an expert but I was pretty successful and my friend John who is teaching me did even better. He caught 44 swarms.