Yes, the Charlie Chan comics ran until May 31, 1942. In our current "run," which is presented here at our "Charlie Chan Sunday Comics" section, we are about two years from the end of the series.
On a recent eBay auction, I was able to obtain several more Charlie Chan Sunday comics. These filled some of the holes that we currently have in our collection. Over time, hopefully, these holes will become smaller and fewer. For now, whenever we have a gap, we must rely on "second hand" material, which, in some instances, is not of the best quality.
Sorry. In my haste, I spoke on our SUNDAY comics! As far as the dailies go, there is a very limited amount of available images, all "second-hand." My eyes are always open for more material, however.