Although there had been rumors that Charles Chaplin, who started out working for Mack Sennett, had once been a Kop, it had never been definitively shown to be true. However, in 2010 a 1914 Keystone Kop short that had previously thought to have been lost, A Thief Catcher (1914), was found at an antique sale in Michigan. In it Chaplin can be clearly seen as playing a Kop.
$4 Million