HOLLYWOOD — Billy Wilder’s six Oscar statuettes, as well as his Irving G. Thalberg Award, were returned to the Academy of Motion Picture Arts & Sciences Tuesday by his widow, Audrey. Writer-helmer died in March at 95.The surprise presentation was made during a scheduled AMPAS screening of “The Lost Weekend,” for which Wilder won two Oscars (writing and directing). Academy prexy Frank Pierson was on hand to unveil and accept the statuettes. Screening was part of the Acad’s “Facets of the Diamond: 75 Years of Best Picture Winners” program, in which all of the films that have won best picture are being presented chronologically. One of Wilder’s statuettes will be featured in the 75th anniversary exhibition at the Academy in February and March.