I think there are these too somewhere:
Bill & Ted's Excellent Adventure
Caesar's Palace
Captain America
Defender 2
Dragon Power
Everet & Lendel Top Player's Tennis
Gotcha!
Immortal
Jack Nicklaus Golf
Pinbot
Road Runner
Rocketeer
Rollerball
Rolling Thunder
Section Z
Stealth (if you mean stealth ATF)
Winter Games
Red ones not quite sure, other near 100%
Section Z is only available as a PAL version, and I know you have the box for Stealth ATF which is also PAL/EU (not sure if anyone made a cover for it or not). Rolling Thunder is one of the boxes that BGC scanned in but AFAIK nobody's done a cover for it. Someone scanned in Captain America but it was too blurry to be usable. I definitely need all of those myself along with Dragon Power (never seen anything on this game) and Defender 2, so if they're out there, cough 'em up!
I have no idea where it has gone.
It's safe somewhere, but where? 
Well if you don't know where it is, then I wouldn't call it safe at all! Your Othello box could be in the hands of evildoers...or even worse...SEGA FANS!

Therefore I must insist that whatever you are doing right now you stop and devote all your time to looking for it. The poor box could be in danger and you may be its last hope! You don't want to live with that on your conscience, do you? What if something happens to it that you could have prevented? You'd never be able to live with yourself! Go forth, and conquer...er...find your Othello box!
