I have 3 hives, two of which seem to be good and strong. The third seems to be stagnating, but I'm not sure what to do. I saw the queen a week ago, but couldn't find her today (but i assume she's in there), and the brood pattern is very spotty. They're in 3 medium 10-frame boxes, but the third box is virtually unused. I took a bunch of pictures today, and was hoping for feedback. Do I need to requeen? Do you see anything that looks concerning aside from the lack of activity?

Bottom Box:
Top of box: http://imgur.com/a/CceDI#8
Foundationless Frame: (added a week ago, formerly there were only 9 frames in the box) http://imgur.com/a/CceDI#9
Brood Frame: http://imgur.com/a/CceDI#11

Second Box:
Top of box: http://imgur.com/a/CceDI#2
Brood Frame: http://imgur.com/a/CceDI#3
Brood Frame: http://imgur.com/a/CceDI#5
Brood Frame: http://imgur.com/a/CceDI#6