@MandaRae IMO you don't owe anyone here anything further.
I don't care if they're coop sleuths, curious or don't believe you.
This thread has gotten out of hand.
Grieve in peace.
This sounds great for the OP but the neighbor will not think so. I'm sure you're saying so what?
What will most likely happen is then they'll become unlikely to do what is right. Then what? Fight it out with them? Take it to court?
Courts would very rarely award that unless you live in a nut job...
Look on CL for what breeds and ages yours were or comparable birds. Charge that plus price of materials to repair. And if you want (I would) tack on a couple hours labor cost. $10 or $15 a hour.
IMO that's fair and its what courts would decide if they were involved.