First thing .. I'll say that I won't be so easy going again to anybody from the forums wanting to buy something. It was only $200 lens adapter, sold for under $100. I don't have Paypal and decided to just ship the item to Brooklyn with full payment to follow later. It's not high dollar, and I haven't had a no-pay ever, at least in my arborist work since 1988.
Long story short, the photog who used the forum until February got the item, and final pay was dueFebruary. About a month ago he sent an excuse email about an apartment revamped or something. but evident he's dodging, and he's not logging in. I have no phone listing, but he's for real, with a Youtube videos showing drone photography for real estate, etc..
I decided to take a different approach. less for the money, because I can earn double what he owes with a single tip from customers. And mostly just to needle the guy for taking something not paid for.
From his drone videos on Youtube, I found the listings on Zillow and started to call the real estate agents. One even gave a name of a media company. Without a direct accusation, I simply ask if they have solutions to stimulate some movement from the Photog to follow through on dept promised and owed. Even though I'm calling from across the nation, the real estate folks had a smile in their voice, and were eager to lend an ear. What I see most productive isn't collecting, as finding an alternate avenue or solution to some form of progress. I've enjoyed problem solving over the years, and maybe why I liked the game Zelda so much.

