My 4 RIR mixes are 4.5 months old. I was watching carefully for signs of laying. 3 hens, 1 rooster. Today went in to see them all happily eating an egg, shell and all. No clue how long they have been at this, I have never seen an egg from them before! I gave them a bunch of ceramic eggs to see what they would do and they all attacked them (clearly they have been doing this for a while). I filled an egg with mustard and they immediately cracked that egg open, and ate most the mustard! What kind of roll away nesting box do people recommend? How do you teach them to use a box? (No signs the boxes have been used). Coop is 5X7 and run is 5X8. 2 nesting boxes. I just added oyster shell today (instructions said not to until they were laying). Any other suggestions? These are my first chickens and I do not know where we went wrong.