Something like this happened to me years ago. A neighbor had a dingo for a pet and had it in a fenced yard with electric run through it-----because the dog had dug under the fence before. Well, apparently the electric fencing had a short in it, and the dingo got out. I and my 3 children (2, 6, and 9) were out shopping for Thanksgiving dinner----this was the day before Thanksgiving. When we got back, it was to the most horrible scene I could imagine-----chickens and ducks laying dead all over my yard. I will never forget having to go around and pick up my beloved pets and the children crying.
That stupid animal had killed all but 2 of my birds----my one-legged B.O., and a young silkie-----they were smart and just sat hiding under some bushes by my front porch. I didn't call animal control, but found out who did it not only because our next-door neighbor saw the dingo leaving, but the ownes actually came and left a note with their phone number. They wanted to replace my chickens with some from an Amish man the husband knew! Right-----these were hand-picked birds from a friend of mine who raises all kinds of breeds and has wonderful birds----not just some run-of-the-mill leghorns. I said, "No, I'll take a cash reimbursement for my birds."-----following advice from the wife's father, they paid me $75 and promised to keep their dingo contained. I never did see that dog again----maybe her dad convinced them it was a liability and they got rid of it.
I think your loss of 2 chickens is just as horrible----you raised and cared for them all this time. They can only pay for the damage, not reimburse you for the trauma and pain. I hope your children quickly forget what happened, and that you get paid for what happened.