A hammer and a screwdriver will fix it.
Seriously though, I'm surprised that Arson got his off with just the allen bolts coming out because I don't think I can take my R1 gas cap off with just the bolts on the outside either. I believe there is one bolt that is actually under the cap itself and they do that so no one can steal it. Otherwise, what the hell is the point of the locking gas cap in the first place if you can just undo the bolts and take it?
However, hopefully he can hook you up and get someone to help you release it so you can replace it.