The best I can put forward, is that the original owner will have to leave Argentina with it. After they "leave" (ie. you are in no mans land between boarders.) you can enter the next country on your bike, in your name. Or, just get out of Argentina without coming in contact with ANY Argentinian authorities and at the next boarder, all will be 'cleaned up.' This is what I had to do when my papers for Ecuador expired. (Do NOT stop at the argentinian aduana either.)
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