Attempting to scam

Just wanted to make sure this guy never comes back to the site.

He tried to do the exact same thing to me as mentioned in another review.
Offered $300 - $25 over the original price of $275 back then - that is if I was to go first. I told him, lets do Trade Guardian, because the total would be still $300 for him anyways and I don't mind missing out on $25 if it made the trade secure for both of us.
He insisted that Trade Guardians have scammed him in the past with no evidence for it (he used TG for his previous low price items without an issue).