i'm so sorry!
I would personally deliver the neighbor an invoice of the cost of the chickens and the damage to the coop. And if you can, attach some pictures of the damage done. I would call the police and file a report so the event is on records and maybe ask them what you can legally do. Ask perhaps if you had loose animals on the property if you could deliver them to the pound yourself. Keep records of everything you've done. Perhaps invest in an electric fence?
