What if you took a camera and snapped a couple of photos of the wiring and especially the business card of the person who performed said work (and all other components) prior to touching any of it yourself? Then you write a simple, short report to document the conditions and you potentially could share said report with a) AHJ, b) Homeowner, c) local regulatory body, and/or d) Fire Dept or similar.
At a minimum, a good business practice would be to keep a record of the 'before' condition and an 'after' photo when your own work is done (in case someone else modifies your work after you're gone, too).
If said property (or other property with the same character's work) is ever involved in a spark-related crisis, you have some valuable information that helps clarify what work was done and the manner in which it was done and you'd probably be an over-achiever in the eyes of a claims adjuster.
