We had two just like that night before last when we got home from the day at my mom's. My DH went out to check for eggs because I was afraid of them freezing. (and chicken to go out there at night) He came in and told me and was worried something had been in there either scaring them or had knocked the eggs out of the egg boxes. Not the egg box thing....the lip is too high. And the eggs were right under where they were roosting.
I think they laid while on the roost. It gets dark so much earlier...maybe they needed to lay and everyone got on the roost and they did not want to be left behind. Regardless, I got some paper towels and went out to clean it up....but made DH go with me.
Seldom do things happen like this....but once in a while.....