Over on TOP, there is a link to an article by Richard B. Woodward, Too Much of a Good Thing. From the article...
"Another factor casting doubt on the authenticity of all these "vintage" Hines is that many look eerily like Rosenblum's own photographs. The Chicago dealer Alan Koppel first pointed out the likeness, to the Santa Fe dealer Andrew Smith at an Association of International Photography Art Dealers show at the New York Hilton in February of 1999. Smith had a gorgeous print of Hine's Three Riveters hanging in his booth. Koppel stopped by and observed that the Rosenblum photographs he had seen and the Hine prints that dealers had bought from the Rosenblums had a "similar tonality—the same clean, hard surface and cold grays.""
Were it not for seeing, not just looking, this may have gone undiscovered. The science and research are very interesting; the timeline of photo papers is significant, but with out a little connoisseurship, this "fraud" may have gone undiscovered.
I'm ambivalent about sympathy for the investors; mostly that they were led by "experts" who were "wrong". Invest some time in seeing, in connoisseurship. Sour grapes on my part, I admit. Bad me.