I peeked at Colony 13 inside Hive H. There is nothing there: no comb and no cluster of bees.
I was uncertain whether there was a Queen after I'd found a dead Queen in the swarm box. I had put on a feeder on to stimulate them but I'd seen robbing in progress from Colony 11. It appears that robbing is all that's going on.
I don't know what has happened to the bees which I put into the hive. They may have dispersed to the other colonies on the roof.
When the feeder is completely empty I'll be able to see what is left.