Besides the fake aging, a main giveaway is his that all of the letters in the word "DETROIT" appear to be the same size. The "D" should be taller than the other letters. But maybe I am just not seeing your picture correctly. Maybe the "D" is slightly bigger in your picture too.
I think the Red Cobb comes in Piedmont 350 and not 150. The Green Cobb comes in 150:
https://www.t206resource.com/Piedmon...Checklist.html
The seller is
mysterium009. It is possible (but extremely unlike) he didn't know it was fake. But he should have done some due diligence before selling it anyway (in the off chance he didn't know it was fake).