There was a guy at the National that had a whole table full of them. Dozens and dozens of them. I even kinda looked behind his table a bit to see if I could find the raw materials he was using to make them.
I was surprised to see them there, but he was only charging a few dollars for them. So for folks who wanted to spend a couple bucks and "open" packs with old cards in them, no harm no foul. But as they are not original manufacturer's packs, and are not even period pieces, I think they are novelties at best.
kevin