An acquaintance of Dwain Rogers told me last weekend that someone had stolen Dwain's authentication stamp & that any certifications after a certain date were Fakes.
Has anyone heard about this statement & has he ceased selling certifications of authenticity?

False rumor.
What came to mind was the stamp the Librarian was using when Indy was smashing a hole in the cathedral floor

Dwain says his certifications are 100% PC generated, no theft possible.

BUT he adds that forged certificates of any certifier by the true flint criminal has been known.