As of last week, I don't believe I have any brood in my established colonies. Well, at least I didn't dig deep. I just didn't want to chill them if they were present. But, you are right. I would really like to know if there is a queen in that log. I am sure there is but it's been too cold for them to fly away if there isn't.
I have a third bee tree waiting on me. I am going to extract it on the spot though. Just as soon as the weather warms a bit more.