Per SPQR, it's just promotional advertising. A sample. A souvenir. No cat#, no grade or grading number, no attempt to imitate their stamp slabs. The stamp show equivalent of junk mail.
The coin expertisers hand out similar promo items:
https://www.pcgs.com/news/pcgs-laun...splay-at-fun"Since 1986, PCGS has been giving out samples of its holders featuring hundreds of different coin types, both U.S. and world. They have become highly collectible over the last 30 years, although they originally were only intended as free promotional items," said PCGS President Don Willis.
I suppose that if some of you got an invite to the luncheon mentioned, you wouldn't go because the food could be drugged?