^THAT^Making fake serial stickers. But the lack of stamped sticker on the back and gold plating still make them easy to spot.
He sells them as "used" and doesn't say that they are reproductions. I guess that if he plugged them once, you can call them used now.
Stickers are FAKE and copy an exsiting serial number of another PCB, probably to try to mislead people checking if that serial number is real.