Hello, For the record again, I no longer recommend Blackrock too many having issues with application and tons of folks using it on non recommended leathers which will have a messy result.
On to your question,
Regarding your bag, its not just surface marks which will just clean off... when dark marks sit on top of light colored leathers they often stain the leather so even if you manage to clean of the surface you often have a stain. Additionally you have areas with missing top skin on your corners those would need corrected with color restoration either at Hermes spa or another trusted professional or via a luxury leather color touch up kit at home.
I hope this helps? All the best,doc
PS: box calf and charmonix are basically the same the later can be considered the matte version.