Defrost Wagyu Tenderloin

Hello, I just bought some Wagyu tenderloin from Alpine Butcher and they arrived frozen. Should I remove them from the packaging to defrost in the refrigerator or defrost them in their original packaging in the refrigerator? Or is there a better way? I plan to cook them for a family dinner in 3 days. I plan to dry brine them, because the marbling isn't that good.