Long story short, I bought a set of NGK 97506 (BMW SILZKBR8D8S) off of a Chinese seller on eBay just to see if they would be the real deal. I had no intention of ever installing them on my car, or reselling them anywhere.
I've had experience dealing with counterfeits in the past with Sandisk MicroSD cards which were also sold by someone from China. Although, I must say that these sellers are more than willing to issue a refund, and sometimes let you keep the item(s) once you call them out with supporting evidence.
See if you can spot the fake ones using the following guide:
https://www.driven2automotive.com/bl...m-august-2017/