> my question is why hasn't the FBI seized every Amazon warehouse for knowingly selling counterfeit goods?
What government would kill the goose that lays golden eggs? They pay tax. Buyers pay tax. Huge amount (but not that much as I expected [0]). What else is needed?
What little taxes they pay state/locally are next to nothing because of sweetheart deals in exchange for locating warehouses and offices in particular areas...deals which mean they likely pay less tax than the costs they incur on the communities in terms of services and infrastructure.