The mistake/misrepresentation (whether it was intentional or not I do not know) has been repeated in subsequent stories trumpeting the Nova Scotia "discoveries." Do any of these reporters who put their names on stories bother to check anything? My computer has this feature where I right-click on an image and it lets me search for the image on Google. I bet yours does, too. Try it!
". . . you are dealing with a rare museum artifact which a significant portion of the revenues of such artifact will come from the very photos you are using as they are added to text books, table books, research materials and other intellectual property."
Whether there's a real "shield boss" or not I have no idea. If the "shield boss" is as convincing as the "Roman sword," it doesn't surprise me that Pulitzer substituted an image of a real one. Maybe the "shield boss" is really an old hubcap. Or a WWI helmet. Or a dog food bowl. Who really knows anymore.
Journalists could be helpful here. So far, they have really not been.