I believe Del was being tongue in cheek about those certificates.
Adding blade etches, numbers on bolsters is not rocket science, and only takes a few minutes. I've seen a lot of knives obviously made as SFOs for U.S. Tobacco being etched to make them 100th anniversary editions. As long as a guy can make a few dollars more....or a copy of a mass printed generic certificate....
Some photosamples were stamped 0000, and not PS0000. Why would there be two? Dunno. Ask the guy you bought them from. How did HE explain it? Who did HE buy them from?
Codger