I am for sure there are no hidden nests. I have a urban backyard (not tiny but certainly urban size) and Munk (bird in question) is attached to the hip of my flock leader Joon. I am sure there are no hidden nests. Munk has a comb, and it's as red as any I have seen, but it has been for a loong time. She has squatted two or three times for me, but still nothing. Her "soul friend-mate" Joon has been laying since Janurary, and the other two I have are laying also. Munk will lay next to the nest while Joon lays her egg, but that's as close as she gets lol.
Ah well, I love her regardless. Hopefully I will have a few more to bring up the egg count. Right now we are still burning through the eggs we get, so I want two or three more that lay (hopefully LOL)