What a bummer you lost them. How often can you catch them? I've worked hard with my bees, I don't want I lose them. I'm planning on getting another hive set up, just in case. I've been researching splitting a lot trying to figure out how best to deal with it.
We have caught 3 of the 6 that we know of.
One went into the bait hive.
One went into a tree about 20' high ~ we got that one with a ladder.
And the 3rd one was easy ~ less than 6' high in a cedar tree.
The one that went in the bait hive we kept and the other two we gave to friends ~ one who is a new beekeeper and those are his first bees and one who is a long time beekeeper who lost bees over the winter.
We have 20 hives that we keep and right now 3 nucs that we are selling. We may do more nucs for sale especially if we catch any more swarms.