You did well with the reverse image search and dodged a bullet there.
They must trawl the net for Wanted ads and then capitalise on the trust levels on shared-interest forums. So I guess it pays to check if they are a new member with no posts in their history.
I recently had a workshop clean up and advertised a lot of excess tools, drill press, equipment and a classic car for sale on the net. What a deluge of scammers! I got so sick of their antics — easily spotted because they offered full price without any discussion or questions, then had some story about being out of town and sending their “agent” to collect it and wanting payment by some oddball service etc etc.
In the end my standard answer was “Please call me to discuss”. They never did. Moral of the story: Always talk to the other party by phone before committing to anything. If in conversation they don’t seem to know a tailstock from a toolpost, run!
A lot of them kept asking for more photos of the item for sale and then never responded after I sent them. Apparently they use those photos to create their own scam ad for your goods! So your Google reverse image search is certainly the way to go.
Take care. It’s a jungle out there.