You can return the book, but (having been through this myself) tellingly when you select a reason for the return they do not give you an option for “Counterfeit

You can return the book, but (having been through this myself) tellingly when you select a reason for the return they do not give you an option for “Counterfeit Good”. You have to pick a vaguely related reason like “Item Not As Described” and then you can optionally leave a comment noting that it is counterfeit. There is no indication that anyone ever looks at that comment, or takes any action about it.