I have a Waku Waku 7 MVS cart that is in one of these cases. It is 100% legit, I have opened it up and inspected it... I bought it from Video Connections... I have no idea what it is, I just thought that's how the case was.
My Japanese Art of fighting 3 and Real Bout Fatal Fury Special MVS carts came in white cases. They were bought from seperate sources and upon cracking them open appear totally legit.
You know it really feels good to be able to crack an MVS cart open with ease to see if it's legit...This is 'NO DISRESPECT' to the home system owner...I plan on getting ahold of another home system in the future but it's not easy to crack a home cart open and look under the hood with that sticker in the way. Then you have to un-lock the cart from it's sides...
-BB