I can sure tell you are frustrated, and you think that you are doing the best you can. But I saw a lady wearing a T-shirt one day while we were visiting Washington, DC, and what that shirt said has stuck with me ever since. It said, "My Rights End Where Your Toes Begin." That means that while you do have the right to let your chickens out to free range, your neighbor also has the right to enjoy his/her yard without stepping in chicken poop and having plants torn up. Rights come with responsibilities.
I know you are not convinced that your chickens are doing the damage, but change things around. Let's imagine that your neighbor has a pet elephant. You don't mind the elephant as long as it stays on it's own property. In fact, you even enjoy sitting outside and watching him. But then one day the elephant wanders over to your yard. He doesn't know he's doing anything wrong by stepping on your chickens. He doesn't know that you don't want to step in elephant poop, and he doesn't care that the leaves he's nibbling on are your mom's plants she has been trying to grow. Not all plants come back from being nibbled on. He just knows that there was something interesting over your way, and then he couldn't find his way back. Suddenly you don't like that elephant so much anymore, but he's already learned that he can get yummy things to eat and have more room if he adds your yard to his as part of his territory. What do you do when your neighbor says that all the damage isn't from his elephant?
I don't know if your neighbor did anything to your chicken or not. If it was free ranging any one of a dozen things could have happened to it - dogs, a car...who knows? And I don't know the laws in your area about neighbors killing a chicken if it is on their property. But it does sound like you love your chickens a lot, and when you love something that depends on you for it's care and comfort, you should do everything in your power to protect it. I wish you good luck with your chickens, and I hope you can find a way to solve your problem.
First of all, I am not accusing that my neighbor killed my chicken. I am just saying that it is not right for him/her or any other people to kill my chicken regardless of what he/she did, or what my other chicken did.
"What do you do when your neighbor says that all the damage isn't from his elephant?" -My neighbor and I already knew and saw that my chickens did some minor damage to his/her plants(only a few leaves were eaten) and they only went there a few times and I am sure that they grow back, so obviously, lying about is not the right thing to do and it is not beneficial. I am sure, that some cats bury their feces and urine near the plant, since my neighbor even confirmed that happened. So it is obvious that the blame can't be passed on to my pets every time, since everyday, my other neighbor's cat also go to her property everyday, and make a mess that look like my chickens mess. Also, wild birds poop can look like chicken poop, and they are everywhere on our neighborhood.
"My Rights End Where Your Toes Begin. That means that while you do have the right to let your chickens out to free range, your neighbor also has the right to enjoy his/her yard without stepping in chicken poop and having plants torn up" - Lets be realistic. Undesirable things done by animals happened to all people. Wild birds make poop on all of my neighbors property, some insects and birds eat the tree fruits, and other vegetation, etc. What do people do? Some kill them, while others just let them do it, and clean up the mess that they made. My chickens rarely go to their property, since I didn't see any chicken poop(except old chicken poop) on their property, and whenever they go to their property, that is like a wild bird making poop on my property and an insect eating the fruits and/leaves of my plant. Is it better to make those insects and animals who does undesirable things to people become extinct, so that those things will not happen again, instead of letting them do what they naturally do, which means that people have to share and clean up the little mess that they made? I read that some parrot species are hunted down, and their population are alarmingly low, just because they eat some commercial vegetation. I think the saying,"My Rights End Where Your Toes Begin," should be applied in certain situation. However, I don't think that people have the right to kill my chickens, just because it ate some plant leaves that can regrow, make feces on their property and scatter soil where they are not intended to be.
As for the elephant situation, that is extremely unlikely to ever happen anywhere, in a city. Why would anyone try take care of an elephant inside their property in a city and make it free range and let it do, considerable damage, (house is damage, car is damage, etc)? I myself wouldn't try to take care of an elephant, unless I can place it on a good place. But my chickens only does minor damage to my neighbors plant and minor mess to it's property, just like what wild birds and insects do. If that is to happen to me, then I won't kill the elephant, but I will sue my neighbor for damages, except on any life form, for as long as the losses will grow back. I feed wild birds and I don't mind them making feces on my parent's property. I also don't mind insects eating some plant leaves(they will regrow) and fruits. Although, I do mind, if an animal kill another animal, like a cat killing a wild bird, since they kill it. I wish that animals doesn't eat other animals.
I agree, that I should prevent my chickens from going into some else property, since they might harm them. In fact, the last time that I saw at least 6 month old chickens go into her property was on February this year, and I am checking them many times when they are out(read my other post, how often I check them). I don't think that my chickens wants to add my neighbors property as one of their territory. If they do, then I should be able to see them over there a lot of times, and they would be stuck in there for a long time, since I know that they don't know how to come back, once they have been in there. I feel so sad, that my chick, who should be turning 6 week old on the day that is is missing is missing up to now. It is their first time to go in there, and unlike my more than 6 month old chickens, they probably they don't understand why they shouldn't be in there. I am just going to let my chickens free, even though my neighbors might harm or kill them, since I want them to be happy. I won't restrict their freedom, just because of fear. Maybe he/she will feel guilty about doing it, if he/she do it again, or he/she is going to do it.