I have only seen one un-occupied open air hive here in CA, it obviously didnt survive being at the top of a pine tree about 30' off the ground. My most recent swarm catch last week found a small swarm starting to build comb on a cyclone fence gate. That small swarm is being fed now and building comb quickly in a nuc, along with a drawn frame I threw in there for them!! I hope they make it as they are the lightest colored bees I have ever seen, like sunkists!!