My TBH swarmed. It was installed in Mar same as this one....I didn't see them go but watched them find a spot in a tree...they spent a few hours there then moved...the next morning they moved again and remained there for another 3 days...thought we were going to lure them into another hive but no luck. They were up much higher than any ladder we had and in a heavily wooded area. Cutting the limb or tree wasn't an option since there was so much underbrush. So they are free. Hope they found a good home and will cast off a swarm in my direction someday.
I know what you mean, I lost one earlier this year because they landed about 45 feet up in a tree. At the time, it would have been more trouble and time than I had to dedicate to trying to recover them. I had a couple of swarm traps out but they decided to go elsewhere. :)
However, I've never tried it, but hear it works....if you have another high swarm, you may want to give it a shot. Get a line over the limb they are on, as close to them as possible....throw, sling shot, bow and arrow, etc. etc. Then pull up a frame of brood comb next to them, let it sit for 15, 20 minutes, or a half hour. They say all the bees will move to it, slowly lower it down and hive it.