Just saying, it's much harder to find a feathered legged cuckoo Marans in the US than a clean legged bird. Lots of hatcheries have clean leg cuckoos. From the white skin, messy barring pattern and body shape I think she's a hatchery cuckoo Marans.
they both look like they should be laying--nice red plump combs, healthy looking birds.
Have you tried confining them for a day or so and see if you get eggs? They're very creative about finding places to hide nests.