People, customers, whatever you wanna call it, will believe anything you tell them if you act with enough confidence on the product. Even someone that is a connoisseur still will buy blotters that were not proven LSD, because in the end, everyone wants one thing from this kind of illicit deal - to get high.
I saw a A4 sheet of that hoffman / ohm back in end september 2010 @ amsterdam (8 months since last time i have seen them) . Unfortunately couldnt test at the time but interesting to see what would be this batch, new or old. The same person also had plenty alex gray / ganesha .