I have about 25 hens with 4 laying boxes. Every evening when I check my boxes there are some left over egg shells, yellow on eggs or busted eggs. I am not sure if the chickens are busting the eggs to eat or if I do not have enough boxes for the hens that are laying. I do have some young hens that have not started laying. I also have a mixture of hens: rhode island reds, black copper marans, golden comets and 2 sussex chickens. If I get to check the eggs every couple of hours I normally get around 6 to 9 a day. When I cannot check but once a day I only get 2. Please give me some advice. Thanks.