In the interests of being fair, I'd say it'd be time to actually review all notes on the game.
For instance, where did the 1998 come from? When you finish the reanalysis of what you have and the reliability of it, you're probably still not going to have a solid 90% certainty, but you'll have enough to work with and figure out what you should do going forward.
I'd honestly be a little worried about letting this game slip through the cracks if there's even a SUGGESTION this could be an actual legit MAME target bootleg.
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Try checking the MAME manual at http://docs.mamedev.org
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