For the heck of it, I purchased an auction of ten (new, as described) hucard sleeves from a seller on ebay. They arrived, and amazingly, they really were new! They are official sleeves, and you can tell a hucard was never in any one of them. I ended up ordering 60 more.
I have to wonder how someone could have gotten these however? All I have ever seen previously were those sellers that take the hucard sleeves off of their games and sell them separate. Sometimes they are in good shape, sometimes they are yellowed or gross. These must have been old Turbografx unused stock. Either way, freakin' awesome. My games look so good now