[USA] WTB Ganbare Goemon N64 prototype

Looking for any early prototypes of the first Goemon game on N64. Maybe one from an old TGS is in the hands of a collector out there somewhere? Or some Japanese collector would just luckily find out about this thread. Something tells me this is out there in a private collection somewhere.

I remember looking at early previews of this game in magazines way back then when it was known as Ganbare Goemon 5 and always wondering why it looked so different from what was finally released. I even snipped out all the early preview screens and sent a letter to Nintendo! Will have to scan that and show their response someday.

Not looking for any prototypes of the localized "Mystical Ninja" version in English, only an early version of the original Japanese version. You name the price, will pay whatever you want.

Thanks.