Stop giving Realtors a bad name and let this one slide, will ya?
If the jolly fellow lives on a country property with enough acreage; fits the zoning code and and it does not bother your client; his 12 reindeer is not an issue; otherwise, you have to disclose that
The none permit workshop? Until the Jolly fellow wants to sell his property and/or unles the workshop really affect your client's property and it bothers your client, it's none of your business.
The stacks and stackes mail on his front porch might affect your clients property, then you might want to talk to him. Sounds like he is nice enough fellow and probably don't mind to strighten up the place to help your client and the future neighbot out.
Might have to disclose that your client lives next to a factory/industry area.
Other than that, your client likes him and he is not bothering you. Let him go. He might give you a present instead of a sack of coal.