[jbsports33]

I have never seen them before and have only seen a few die-cut or scarp type issues myself. Most of them are advertising trade card type pieces that would not be classified as any type of set. I think you do make a very good point, anything is possible and R&S could have made all types of sport die-cuts including boxing. I have seen similar non sport issues as well, but I think the baseball pieces are the only ones that seem to carry a set designation to them.

Jimmy