I have looked around for eggs, because the chickens do free range. I've not found any, but that doesn't mean they aren't there! I don't know where you are or what breeds you have, but I'm thinking that breed, latitude, and weather might make a difference. No, I don't have any extra light, or heat, and we've been getting pretty cold here.
My only one laying now is a Welsummer, but she's laid one egg a day for 6 days now! Every one has been in a pretty nest she made herself in the wood chips under the nest boxes. As far as I can tell, no one else is laying.
You're getting a huge amount of eggs for birds that age!
I've had plastic Easter eggs in the nest boxes, but I'm thinking maybe they're too light. So I just ordered some wooden eggs. Hopefully that will encourage my chickens to lay!
Good luck to you!