That would be in addition to the "snow" of wax flakes on the floor inside the hive....you will most likely find bits of comb out the front door from the hive that was robbed.
Thanks for that piece of info. I had no idea. When I started my nuc last month, I noticed what looked like grits all over the landing board one day and wondered what was up. I guess there was some robbing going on from my main hive. Apparently, the nuc got strong enough to defend themselves because I haven't seen it since. When I put them in their new hive last weekend, I didn't use an entrance reducer because of the heat we've been having. Maybe I better get one on until they get a little stronger.. . . you will most likely find bits of comb out the front door from the hive that was robbed.
In such a situation wouldnt the colony create an emergency cell and hence a new queen?Did you see that the queen was still in the hive and uninjured ? Do you still have a reasonable bee population ? If all is well, do as others suggested, reduce the entrance and get feed on them internally (in hive).
.I have seen severe robbing where the queen was killed/injured, hence making the hive unrecoverable
Best of luck