I had a look at the two swarms today; neither has a trace of brood. This implies that both are casts, that is, secondary swarms headed by virgin queens. Hopefully the queens are present, and will mate with my drones, and start laying. I'll check again in a couple of weeks. If there is still no brood, no matter, as I'm planning to raise queens soon anyway.
I'm gradually feeling better, and more able to cope with the work on the plot. I don't know what sort of stomach upset it was that I came down with, but it's been about three weeks now, and I'm still not really feeling well. It's lucky we're into the school holidays.