For the later production and newer shockboxes, I noticed that there are variations in the vinyl used -- particularly the outer vinyl of the shockbox that protects the insert. The games around 1996 use more non-transparent cover and the texture of the material is also different. I noticed this on my KOF95 Jap version and Samurai Shodown3 Jap version. Has anyone noticed this??? The black plastic design/material of the shockbox appears to be same though.