USA is a free market. Everyone is authorized all the time to sell every safe product. The term "authorized reseller" is a linguistic manipulation which benefits manufacturers at the expense of everyone else in society.
Warranty goes with the product until it is used. Companies cannot refuse to honor a warranty because they dislike the person who sold it to you.
Because eVGA did not sell the stolen cards, business laws do not apply to eVGA's dealings with holders of the cards. Therefore eVGA does not have to honor any warranty that would have applied to the cards if eVGA had sold them (to anyone).
I wrote a bit more about this in [0].
