She usually lays them overnight. Found one when I put them to bed at 7pm tonight though. 9/10 times I find them when I check on them first thing in the morning. And I'm positive its her as her egg is distinctive.
The others are all using the nesting boxes. I'm positive.
I am almost 100%...
My 18 month Speckled Sussex has been laying from the roost for the past 2 months... lol! Some eggs are fine, most unsalvageable. Only a couple have made it into the nesting box. She never did this until about 2 months ago when she became head of the pecking order due to the head passing away...