I have two hens up to this trick. They both have been sitting in the nesting boxes (one minute there in each box then they swap then there in together). They have been very aggressive when i try to get near them but i look every day to see if there is any eggs under them. I dont mind if they do go broody but they are just sitting there on no eggs and they spend 2-3 hours out doors during the day. Shall i leave some eggs under them or are they just doing it for something to do as they dont seem 100% broody.