I should go back through my cards from the last 80s and early 90s. I know I have a bunch of rookie Griffey and Hurt cards.
Also have bunch of the famous Billy Ripken mistake cards,
Gammons has every GM's number in his cell phone. He reports what he hears or is told from GM's. If a trade he reports doesn't go down, it is not like he is making it up. The deal fell through. He doesn't just make up deals for the sake of people listening.