Take the refund. If it's an item the hackers want to sell under that companys name, then you realize it's most likely stolen? It's a crime to buy and posses stolen goods, and gets worse if you knowingly do it. And, trust me, but "I didn't know it was stolen", is not going to fly later, when you yourself knew the item was half price for no good reason, and you were informed by the company that the sale is illegitimate.