I searched for a total of 9 hours to find 7 missing birds after a fox attack last week. I did not hear any crows in the distance or find any feathers and had no idea if any were still alive. After 9 hours I found nothing. Your luck must be better than mine, go out and call and search. If they are injured they may be hiding. I brought a bread bag with me to luer them in cause that was their fav. So, grab thier favorite, noisy treat, a shotgun and get to hiking. I would even ask your neighbors if you can search thier properties, I searched everyones barns and garages (with permission). I will pray for you and your chickens.