Bought some discounted Forever stamps on eBay. I'm always skeptical of sellers with lots of cheap Forever stamps. Immediately checked them under shortwave UV and there's no glow. Last photo shows these compared to a cancelled genuine stamp under shortwave UV. I sent the photos to an editor at Scott and he confirmed they know of three counterfeit varieties of these 2018 flags (Scott 5262) that will be in their 2020 Scott U.S. Specialized Catalog. I did a little research before buying and knew of fake fireworks flag coils, Diwali sheets, and some other flag books, but I did not see these 2018 flag books posted anywhere. They have the microprinted USPS but not the UV tagging.