I don't think that what he did is unreasonable. Until hunting land became a high dollar business, pretty much everyone looking to hunt private land would just knock on the landowner's door. If he didn't live on the property, we'd use public domain information to find the address. I don't bother doing it now because these days the answer is always either "No" or "Sure - that will by $5K a season," not because I think it's unethical. Ethically, it's not any worse (and is probably less annoying) than somebody knocking on your door to sell you something or convert you to their religion.