Hi CCar, I caught them in a nuc box that I put together last year and set on the shelf in the back yard behind my shed, about 5 feet off the ground and mostly in the shade. It's the same spot I put it last year with no results, but this time I had some drawn comb in the box. I guess that did the trick. They were all over the two used frames in the box. The third frame was fresh wired foundation and the two I just added are foundationless frames which I added around the drawn frames.
They could be from the hive under the shed but who knows. They look similar, mutts for sure. They are smaller and darker than the package Italian bees I had last year. Maybe the ones I saw are just old bees from last year grown on natural comb. Just looking at the outside of the shed hive, the numbers flying out looks about the same, but the buzz through the floor is not quite as loud (and that could be my imagination). I think change from cold wet weather to warm weather must have triggered swarming around here. Two folks here at work have seen other swarms since the weekend.