That whole things with the bearding is strange. People will tell you until they are blue in the face, when this happens, add more room, ensure proper ventilation, blah, blah, blah. This past summer, I had a hive that was CONSTANTLY outside, bearding. I have screened bottoms, open covers, plenty of room, and yet they still stayed outside. I did the same thing to my second hive, and they went in for the most part, but some did stay outside. So, the recommendations aren't always 100% just because the bees are going to do, what the bees want to do. Since you added that extra box, when it cools down, I'd bet ten bucks that the majority of them will go inside. Even now, with our nights getting into the low 50s and high 40s, I still have a few bees outside their hive. When it gets colder than that, they will be just like any other critter (humans included), they are going to take their butts inside to keep warm. They will find a way in.