I highly doubt legally he could pursue it.
The admin account in question was probably attained through legal methods.
Laws regarding hacking vary by state but in general they need to use a unauthorized mechanism.
If the Admin was duped into revealing his password, no laws current or future consider social engineering illegal.(Impersonating businesses or people could make it Fraud)
If the user then used the Admins account to perform commands in the game using authorized mechanisms he broke no law.
Still there is the burden of proof, Since RPGWO logs are not common I.T. study, only the person filing charges(mickey) could be a technical witness.
Also, Let's not forget how lazy mickey is.