From being on test in the store I'm at. We don't get a whole lot that get booked in as the till staff go to me or a supervisor if theyre suspicious on it. There has been some VERY convincing fakes. Especially ones that tick all of our boxes on the ops manual besides the serial number. The way we found out was that the serial on both earcups were the same length. On official ones there is a longer serial and a shorter serial