That's a lot of ducks!
I have a boy and three layers; one KC has been consistent, one KC has become sporadic, and my IR stopped after she had to go into solitary confinement for her sore leg. I'm sure she'll start laying again soon. Mine are shut up at night, one always lays in their house, and I've found a place outside where one lays after they've been let out. I found it because I noticed that the others were hanging around waiting for her, I went and caught her lurking in overgrowth and when I went back later there was an egg.
I still haven't found where my blooming Cream Legbar chickens are laying though, despite trying to stalk them. They're about 29 weeks now, and have red wattles and combs, so MUST be laying - so frustrating!