Robbing bees will fly fast from the hive. They gotta get home w/ their illgotten gains.
Robbers are shiny looking too, being wet w/ honey.
When you open a hive which is being robbed, the robber bees will fly up off of between the combs in a pissy attitude, some stinging and others flying away.
When you see bees frantically working at trying to get into hives, or a hive, from places other than the main entrance, chances are they are robber bees. Check what's going on inside. It may be too late to salvage the colony. The colony maybe too weak or queenless to be viable.
But, if it is still a good colony, duct tape all the cracks and reduce the entrance down to the space of a couple of bees, making entrance gaurding easier.
I hope that isn't too many answers.

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