Josh - I just came across your question about the ST Monza on CL. Assume you are referring to the one located in CT? Forget the exact city, but pretty close to NYC.
I can't say for certain because I never saw it in person, but I don't think it's a scam. Sure seems like the guy physically possesses the truck because he sent me a number of specific pictures I asked for. I talked to the seller (Mark?) who says he is selling it for his brother-in-law. He's was light on information, stating that it's not his truck, but he was willing to share what he knew. From the pictures it appeared to be in decent condition, but maybe a bit neglected mechanically due to lack of use. Said his brother-in-law had it in the Hamptons but didn't use it much in the last few years.