ARLINGTON, VA (AP).-A short silent comedy that was lost for decades holds a big surprise for film buffs and historians when a familiar face emerges from the bushes in police uniform and that unforgettable mustache. The 1914 film, “A Thief Catcher,” was missing for so many years that everyone forgot Charlie Chaplin made a brief cameo as a buffoon Keystone cop, with all his familiar twitches and gestures. Out of nowhere, the 10-minute film turned up late last year at an antiques sale in Taylor, Mich. Film historian Paul Gierucki thought he was buying just another Keystone Studios comedy and didn’t watch the 16mm print for months. Then, in March, he saw Chaplin bumble onto the screen and slap around some hooligans in the film starring Ford Sterling, Mack Swain and Edgar Kennedy. Chaplin is on screen for all of three minutes. “Is this who I think it is?” Gierucki asked his friend and fellow film collector Richard Roberts. He e-mailed Roberts a