Where does Costco get their Wagyu?

I'm curious to know, where exactly does Costco source their highly sought-after Wagyu beef from? Are they working directly with reputable Wagyu breeders in Japan, or do they have partnerships with reputable farms in other countries that specialize in Wagyu cattle? How does Costco ensure the authenticity and quality of the Wagyu beef they offer to their customers? Are there any specific criteria or standards that they adhere to when selecting their Wagyu suppliers? I'd love to learn more about the supply chain behind this luxurious product.