I haven't seen any fakes personally, but I thank you for bringing this to my attention. I certainly will be on the lookout for such scams in the future. I had one incident where I bought from a supplier on Ebay and the envelope that was supposed to include the currency wasn't even sealed properly and nothing was in the package, so I paid for an empty package basically - truly a disappointment.
It's discouraging to see so many people abusing the free market with their ripoffs and scams. It makes me more skeptical of merchants in the long run.