So the bee removal I did went well, except that the bees didn't like the hive.

BUT, I think they're still here - sort of.
It's been two weeks since the removal and they all but left the next day.
Today I went out and sat at my usual spot off to the side of the flight path and I usually sit and record or take still shots of the bees. I see some bigger bees coming in and out of the hives. They aren't coming in with pollen as my honey bees are. They are just there, in and out. They're like twice the size of my bees.
Could they be robbers? Would my bees just let them come in and take what they want?
I took video and still pics. Would like to know where and how to post those so I can get an opinion on what's happening. I really hope that's not the case.
I don't know what to do. Help please. Elaine.