This sounds suspicious...

It’s already sold according to ad.  Until you see a complaint how do you know ?

it may have had a cosmetic issue  ?   I have bought some great products where a owner just wanted to unload gear I bought agreat pass labs amp at 40% of retail and only 1 year old . The owner has $$ and had literally 15 amplifiers he just likes to rotate  gear and he gets  25% off almost anything he owns , dealers love him.

i agree though ,Most of the time ,if it looks to good to be true it usually is.

They stick out like sore thumbs 

Well hopefully all’s well that ends well.

Is it possible that the scammer will post items, have a coconspirator buy them, and then create a positive sales history to better fool discerning buyers?

Link goes to la la land so I assume it has been taken down.  

Many reported that it has sold.  Scammers don't usually mark their ads sold, at least not promptly. They would love to scam multiple people with the same ad.

Jerry