Let me think... I remember that there's a TV show called "Richard the Jeweler" which features real-life cases involving stolen jewelry and how they were recovered. If that's the case, then "Vol 9" might refer to the ninth volume in a series of case files from that show. But I'm not entirely sure. I should verify this.

Since I can't access the exact case files, I might need to mention generic types of cases, like stolen heirlooms, jewelry lost during travels, or items taken during burglaries. Each case would involve Richard using his knowledge and network to track down the missing items.

Now, the user wants an informative post covering "case files of Jeweler Richard Vol 9". Assuming "Vol 9" is the ninth season of the show, I need to outline some notable cases from that season. However, since I don't have access to the exact content of each season, I might need to talk about the general structure of the show, types of cases handled, methodologies used, and perhaps some specific examples from Volume 9.