[1] http://fortune.com/2016/10/19/apple-amazon-charger-lawsuit/
Can you find a link for genuine Apple headphones from Amazon?
It is certainly the case that some of those sellers are selling fakes. It is also likely that some are selling authentic products.
https://www.amazon.com/Apple-MD827LL-EarPods-Remote-Mic/dp/B...
The Q and A section and many of the reviews are saying that they are fake.
They are $13.99. The real Apple headphones are $29.99
https://www.apple.com/shop/product/MNHF2AM/A/earpods-with-35...
Apple never sells anything at wholesale at over a 50% discount. Where would a third party company be getting new Apple headphones from where they could sell them profitably at $13.99?
Anyway, if many of the units sold are fake and some are real, you'd expect a large number of reviews both ways, which is what you can see.