Get it in writing.

[scootnwinn]

You should add a clause or wording that says something like "the seller acknowledges that this agreement shall be void and deposit will be returned should the condition of the scooter change or be found by a reputable 3rd party to be inaccurately or deceptively described" Nothing should be so black and white.

Also have it notarized or witnessed at least once or its worthless....