Earlier quoted context omitted.
Amazon isn't going to take this seriously until a major company gets burned and the FBI gets involved. Then Amazon will experience what every other company does that gets burned for selling counterfeit goods... the FBI will raid their warehouse and hold all the inventory as evidence until they complete their investigation. Like you said, Amazon doesn't seem concerned that they're selling counterfeit goods -- probably…
There is probably a calculation that the feds will be reticent to do that to an Amazon warehouse as they're generally major employers in the areas they're built in.
https://en.wikipedia.org/wiki/List_of_Amazon.com_locations
They're pretty much universally a rounding error for total population and jobs in their respective metro areas.