So... Wow. What shape was the game in? The story is even better if it ended up being in collector condition...
I laugh as I write this. I have a story not nearly as interesting as yours. Picking up a JP in Alabama. As I'm approaching the address I realize I don't belong there or anywhere in or near the area. Like you I proceeded and realized the thugs might be waiting. In my case I had the seller take a picture of a particular aspect of the game to prove at least the game was near the guy I was in contact with. The purchase and load was uneventful other than I paid him a bit too much for the condition.