If it is coming straight from Amazon, rather than an Amazon seller, then it will not be a counterfeit. If an Amazon seller is even suspected of selling counterfeit merchandise Amazon will cut them off at the knees (withhold their payments and Freeze their account). I know this first hand as I am an Amazon Pro Seller (used books) and had a buyer claim that I had sold them a counterfeit textbook. It wasn't but I had quite a go-around proving it to Amazon.
Of your original question, I haven't a clue.