We've known that counterfeit mics are available for years - the SM57 and SM58 dodgy mics being well known, but a friend sent me an SM7B to try.

Things didn't go that well, to be honest - but not in the way you might imagine. One thing is clear, you do need to be on the ball. In the video, I've run through what I found, and you can hear the genuine SM7B against the fake.