I have several hens of different ages and types. My two older red stars have been laying two eggs a day for about a month now. My Dad keeps telling me I need to keep a "nest egg" in the coop so they know where to lay or they will start laying elsewhere since they are allowed to free range during the day. Is this true? Do I need to keep an egg in the coop or not? They have been laying in the same place in the coop daily without problems.