Howdy darlin I havent been on much but what you could do is get a Rooster Collar for him it will quite his manley calls down and usually stop it all together when he gets use to it.
Are the mothballs in there yard or yours? If its in theres i would make a barrier of dirt so that you can reduce the chemical exposure going into your yard. Its goingto be a pain to decontaminate all that soil it is ruining not to mention all the animals it is going to harm. Ya i think i would...