You will get a lot of education and information from a necropsy, they are a valuable source of information. Chicken ailments are so difficult to diagnose. So sorry you had to go through that, and for your loss..you know you must get a necropsy within twenty four hours of death if you do one. Whatever you do, you would be wise to watch the rest of your flock for strange behavior or symptoms. Chickens will conceal symptoms if you spend a lot of time staring at them, you have to be discreet to get the best idea.