Starting Scooter with no Keys

Hi All,
new to the forum here - and i have a question.

I have a Tao-Tao thunder 50 which was stolen from me last night. Security fotage shows they bad the bike running and rode it right out my back alley. I have the ignition keys, so im wondering how easy is was for the thieves to get the bike started? any idea on how they would have done this?
 
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