Yes. I am guessing that 20th Century-Fox bought back the character rights around 1968 when there was something of a Charlie Chan revival. Fox stood to make a good income as their Chan movies were released for television airings. If seems that Warner Brothers was in the mix, as well! We see that the re-released publicity stills for the films At that time bear the name and logo for “Warner Brothers/ 7 Arts.” This might also explain why Warner somehow holds the rights to “The Black Camel.” This affected the Fox DVD release of that movie in the early 2000s.