So, for an update ...
It looks like another swarm has moved into the brown swarm trap. I took a peek this afternoon to see if it really was a new swarm or if I was just seeing lost foragers from the last swarm that had been living in the box.
There were a lot of bees. More than I would expect from wayward foragers.
And they were really aggressive. I've been able to stand outside the box and watch bees go in and out, but as soon as I picked up a frame, I could smell bananas and had bees all over me. I picked up a second frame looking for a queen, and by that time they had started stinging my gloves. I only had on the jacket and veil with regular pants and tennis shoes. I felt my ankles were vulnerable, so I put the frame down and left. My "mini swarm" stayed with me as I walked to the back of our 10 acres, across to the other side, and over to our 3-sided barn. Once in the barn, I was left with just a single bee. But as soon as I stepped out to get into the truck, the mini swarm was back.
3Reds was with me and had her own personal swarm of angry bees. Fortunately neither of got stung, but we had to drive a ways in the truck for the bees to calm down and leave.
I'm busy for the next two weeks, and then we'll go back out, kill the queen, wait a couple of days and see if they will accept a new queen.