You don't need to report the item, you do need to open a return, send the item back at the seller's expense, get a full refund and leave negative feedback.
Cases work and penalise sellers of counterfeits financially.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)