I wouldn't fret too much about the other one yet John, it's been really cold. If you can, try to put an ear to the side of the hive and try to listen for any humming (they haven't learned the words yet). Maybe this evening when they'd normally be in the hive anyway. Listen to both hives, you should definitely hear something in the active hive, and then you could compare the sound of the inactive hive, see if you notice a difference.
Even if one of the queens was not accepted, that wouldn't mean the entire hive has died. You'll know more once you can get in there, but it's too cold yet. I know it's only in the mid-40's here in Gurnee today, windy with a mix of sleet and rain.
Did you say you have a top feeder on? If you can refill or switch the feeder with a full one without opening the entire hive, that might be something to consider doing. They were stressed in the travel, and now with the cold, they're probably considering up and moving back to GA (just kidding!), but who could blame them for staying put inside?
I pretty much know where Kiel is, I've been up to Door County a few times and have seen the sign - lot's of good farming up your way. I seem to remember sunflower farming in that area too. My dad was raised on a farm in Kenosha county, he's been having fun with me and the bees, helping to assemble the hives, and all, it's been good for both of us - something we can do together.