I have discovered 5 artworks variants presumably for the PS3 "MLB 12: The Show" game, all with an ESRB rating:
1. Red Sox player on front artwork
2. Blue Jays player on front artwork - maybe for Canada
3. Texas Player on front artwork
4. A woman with an "American" jersey - don't know what that's all about
5. Texas player with cover having 2 "#1 Rated Sports Game" seals - one in English, one in French - probably a Canadian release.
Maybe you can enter it as a new variant.