In reference to the other string with the photo of the back to back J, that is the same double J that was shown on the show. The guy that made the post did not take that photo. I think he blamed it on a relative or something. That photo was taken at the site shown on the show. I know because I took that photo!
Why use coins dated after 1882, because he was trying to prove JJ didn't die then. Speculation and BS is what Pastore is really good at. Besides, if you're going to seed a hole you might as well use newer coins because they are cheaper to buy!