Found the stick inside the bottom foam layer of the big box. This was a hint from Commarker, they put it there to prevent from getting lost while customs inspections…
The markcfg7 file contains the controller settings you need and the lens correction information.
If you change lenses, you need to keep the configuration data, but adjust the new lens and import the cor file.
When I get a new lens, I import the markcfg7 file and then create a cor (correction) file for the new lens using any one of the methods. That can be imported, if needed into the device settings.