This is a good place to ask this question: Lately, we’re trying to buy products on Amazon only if it says, “Sold by Amazon.com.” Is that a good way to ensure that the product is not counterfeit? The assumption is that if Amazon is selling something directly, it would be getting it directly from the real manufacturer.
On the other hand, the vast majority of report of counterfeit anecdote I have seen indicated they bought from 3rd party but with FBA. So me personally I still place trust on Sold By Amazon product.
More recently I have seen product where that explicitly points out that Sold By Amazon is "authentic", which is kind of funny and sad. (energizer battery)