Thank you sir.
Having a really rough time finding ANY information other than what has already been uncovered. Even trying to find info about Che-Lu karate is next to impossible (outside of their webpage which doesn't offer much into the style or philosophy). I did a ton of searching today (about two hours worth), looking for prominent karate tournaments in the Panama City area. As expected, there are quite a few of them. I found absolutely ZERO info on any I.C.B or the like.
Feeling like I'm hitting a dead in end here. My guess is that it was intended to be this way. Lets suppose Mr. Miller really did fight early "unsanctioned MMA", shouldn't there be at least SOME RECORD of him fighting somewhere? Kinda reminds me of the whole "Frank Dux / Blood Sport" conspiracy. Not that Mr. Miller has had anywhere near that level of press.
Hoping he responds to the email sent and can provide some more information. Until then, based on everything I've found (or lack thereof), as they say on Mythbusters...I call busted.