Yeah, I never had played a brand new copy of Medal of Honor (either borrow or bought used) and was still able to play online. gr8 is right as well, the code is just for some extra unlocks such as a new scope and a gun. The actual online passes didn't start coming until Battlefield 3, right?
Also, how will we be doing this boosting? Will be do an hour a night for a specific person to get their trophies or just do it all in one go or something else? And for leveling up, gr8 notified me that we would probably just play regular, so will we all be playing together in a squad when we level? 'Cause that would be kick ass to have the APT team tearing up the game!!