About 6 weeks ago I re-queened two hives. At that time I placed the cage below the excluder and honey supers. Both were clearly queenless when I inspected. Both accepted the new queen. I removed the cages about days later.
I just had time to inspect and found brood and larvae above and below both excluders in both colonies.
How do I go about determining if I have two queens without runing the risk of them meeting?