I attempted to find the article but search engines are terrible. They mentioned that advertising companies often have a book of mail tests; things they attempted to mail to see if they would be permitted. Some of the examples included:

A sock with an address written on it, partial addresses, wet paper, vague addresses like your example, local names like “sues bar”, tom cruises house, a sandwich in a bag, poster board, flags. They get pretty creative and like a record of what might work for pitch meetings. Generally if it looks plausible, they attempt it.