I can tell you one thing, if the warden is on his way, your neighbor may be in some very hot water...wardens are extremely powerful...and very busy. They handle a lot more law enforcement than just wildlife these days....if the warden is taking time out of his schedule to stop by that could be...
that is great news! I never understood why people lived in zoned agricultural areas, and then complained when people actually take advantage of the zoning
absolutely put up cameras, NOW! He may try again (if that is what is going on), and if he does, you NEED PROOF before the authorities can do anything. They cannot just speculate.