someone is giveing me there flock of roller pigeons i think he also has some other mixed in. he is giveing me the shed he keep them in to it is 8x10 with nestboxes he has door cut out in the evee with a landing board. we are going to move the shed with pigeons in it he olny lives down the road. my ouestion is how long should i keep them coped up in the shed befor i let them fly free he lets them fly free and he says they come back unless a hawk gets after them.