Im not sure if anyone here is following what you are asking especially as you and Mopar seem to be having an inside discussion above.
As for the "chalk marks", as the cars were hand built, there are many places where the techs would leave marks, initials etc. They are usually in discrete locations, not easily seen, or with out some disassembly. My bumper horns have initials, also found some initials behind the gauge cluster, there are more.
If you post a pic, Im sure you will get an answer, or at least more participation from the group.