User Moparofficial not responding..
I think the only thing to learn from this thread is communication, communication, communication. Had the seller spent 30 seconds to respond to the buyer when he saw the "header" and put a hold on the shipment, I don't think we would have a thread to comment on.
I can't imagine what the response would have been had I been on vacation 2 weeks after I sold that intake and all the sudden Justin wanted a refund. I know how it went when I didn't have the money right away and wasn't sure how it was my fault so it gives me an idea though.
The other thing is, even if the burden of research and education is on the buyer, posting ALL of the pertinent info as the seller means you have less of a chance that the buyer can come back and stir up a mess like this. Even more so as a trusted member of the community as the buyer might think "he would have list that info if it was important, right?" and buy it trusting the guy.