How's this for a meal?

I am complete novice at keeping chickens. I made them nice nesting boxes and have done everything i can to give them a good life. Sorry the picture came out bad but what you can see is two cabbage leaves with there morning meal ready to be given to them. They had carrot peeling, boiled cabbage, potato peelings, boiled rice and crushed egg shells. During the day they get plenty of greens to eat as well. They always have there own chicken food but they seem to ignore that in favour of what i prepare for them.

They have now started to lay eggs but not regular every few days but they lay on the floor outside and the floor of there chicken house but not in the nesting boxes. What's so wrong with a nesting box i don't know.