standman, if there were no attendants in the cage you shouldn't have any worries. If there are attendants in the cage, and one or more dies before the queen gets out, they will block the entrance.
The packages we installed last week didn't have attendants in the cage w/ the queen. Is this the usual way they come? I would think that the queen wouldn't need any attendants, having three lbs of bees in the cage that her cage is in. Just a thought.
Just because something is new to you, doesn't mean it is new, or revolutionary. Mark Berninghausen