It’s possible they’ve chimneyed, where they run thru a couple frames of stores and ended up at the top, or they started brooding up early and ran thru the stores. Either way, it’s not a good sign for this time of year. I would be putting feed on them ASAP.
The easiest (and less stressful on the bees) way would be to set a medium box on a queen excluder, a single piece of newspaper and slightly moistened sugar (5 to 7lb) on that. That way you can just pull the inner cover set it on and seal the joint w/ duct tape.
The easiest (and less stressful on the bees) way would be to set a medium box on a queen excluder, a single piece of newspaper and slightly moistened sugar (5 to 7lb) on that. That way you can just pull the inner cover set it on and seal the joint w/ duct tape.