This chip can not be proven to be a factory error chip.
If someone takes their time and does it right with an exacto knife, even GPI can not tell you if it came from the factory. It is a simple thing to peel the inlays and switch them.
If you buy one, you will never know if it is a real error. There is no difference between a real one and one an ebayer could make in 10 minutes.
I believe we will be seeing more of them on ebay in the near future.