Had two swarms land in two trees about 20' apart, one 10' up the other 12'. Both were within 50 feet of our apiary, and I'm certain one of them was feral, and very large, 8 or 9 lbs. We captured the large one, got it boxed, left the inner cover slightly askew as they were fanning to the remainder of the group to come on in. We had a prior engagement, and had to leave. When we returned 3 hours later, the bees had left the box and were back up on the same branch. It rained for 4 days straight and they stayed there. The other swarm, smaller about 5-6 lbs landed in a different tree. We captured them the same way with our bucket trap, boxed them, and waited. They also left the box, went back to the same branch in their tree. It rained again and got cooler, 40's to 50's for another day. On the 6th day the larger swarm left. I had planned on cutting the branch off and carrying it down although this would have been quite a feat. The smaller swarm waited until the afternoon of the same day, and then they too left.
Both deep boxes had frames with drawn comb, partially drawn, one frame old brood comb, and frames of foundation only. Also within 30 feet of both of them was a swarm trap which they did check out a lot, but decided it was not to their liking. The larger swarm would not have fit in a 5 frame Nuc. Hated to see them go but I guess you can't get them all.
I've read about using an excluder parked on top of the bottom board (once you know you've got the queen in the box) to keep them there. But getting a swarm to "settle in" can be dicey enough as it is, I don't want to stress them too much. We have successfully captured and housed 3 swarms this spring already, just thought it was unusual to have two swarms so close and they just wouldn't stay. I also have caught a swarm in a trap this spring, mounted 15' up on an Oak tree in a nearby town. The peoples' house has a large colony living in their soffet. I'm going to do a cutout when they get a 30' man lift.