And here's the last one. Again, very little info online, but the title confirms that this is a Charlie Chan film to be sure.

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The Wise Charlie Chan Fights the Dark Monopoly (1948)
陈查礼智斗黑霸王 (1948)
陈查理智斗黑霸王 (1948)
http://www.mtime.com/movie/44890/
http://www.cnmdb.com/title/6141/
http://www.mtime.com/movie/45368/

Production Company: 五洲影片公司 Wuzhou Film Company

Director: 毕虎 Hu Bi

Screenwriter : 毕虎 Hu Bi

Principal actors
徐莘园 Ziyuan Xu (Charlie Chan, presumably)
白燕 Yan Bai (Meina Chan, presumably)
殷秀岑 Xiucen Yin