Basically, I think the only way to win is not to play... the way to avoid being gamed into freeing a sufficiently intelligent captive is to not communicate with them in the first place, and your reference to resisting persuasion suggests that that isn't the approach in use. So, no.
Update 2013-09-05.
I have since played two more AI box experiments after this one, winning both.
Update 2013-12-30:
I have lost two more AI box experiments, and won two more. Current Record is 3 Wins, 3 Losses.