Question: Xbox One X Console – How do I know that Microsoft sales this, and it’s not fake ?
The best way I’ve found is to go to Microsoft’s website and "buy" it and from there it will give you options- e.g., Gamestop, Target, etc.- one of which is Amazon. If you click the Amazon link it will bring you to the "official" Amazon seller. In theory.
I bought mine from here and it works great. No issues, I signed up and got my user ID to play from Microsoft.