Because of commingling, anything shipped by amazon might be a fake, even if the seller is legit. Basically if two people (claim to) sell the same product, they get thrown in the same bin in Amazon's warehouse. When you order it you get whatever the worker happens to pick from that bin. Amazon can track it internally by the labels, but have little inclination to do so.
And buy direct, don't use Amazon because of the counterfeit risks.