Yet I find that hard to believe. What series of events would lead to Amazon itself, knowingly or unknowingly, packaging, selling, and shipping an FX chip disguised as a high-end Ryzen? My guess is that he bought it from a third-party seller but was unaware that he did. Amazon has a nasty habit of setting a third-party seller as the first and primary option when you open a product page, even when they themselves also sell and ship the item. I learned of
this website (I'm not affiliated with it) that allows you to search specifically and only for products sold and shipped directly by Amazon.com, to avoid potentially being swindled by a third-party seller, or for any other reason.
Although now that I think about it, I suppose it could have happened by Amazon accepting a returned 9800X3D and not doing due diligence to ensure the returned item was legitimate. But it seems weird for them to sell a returned item as new and not open-box.