There was no chance that the neighbors would' ve let you recover the deer on thier land at all? If the guy was on a stand obviously he was a hunter and you' d think they would have some sympathy and a better understand of the need to find a deer when it' s warm out.
If they were that big of jerks out it you could' ve either called a game warden and asked his advice, or just snuck back in as soon as it got dark and tried to get him out then.
It' s senseless to just waste a deer like that.