Fresh brood looks like this (click the image for a closer view):
I was planning to pull up a frame or two of brood from the bottom box to make sure the queen expanded the brood nest up (a lazy edition of pyramiding), but I found fresh brood on the second or third frame that I inspected. The queen didn’t need any help from me. So I put everything back the way I found it and left the bees alone.
I also filled the frame feeder on the nuc and added a pollen patty.