Building Retaining Wall & Appraiser Left Note About Permit

[Brigham Pyron]

Should I hire a lawyer, or call the county inspector first?  Our contractor didn't get a building permit and now after firing her, I'm finishing it myself.  Now the county appraiser left a door hanger stating he was measuring the "new construction/Building Permit" and has the building permit circled.  I don't know if the appraiser was here for the permitted deck/porch, or saw my pile of gravel for the wall.  I don't know whether I need to treat them like the IRS and don't talk with them directly or do give them a call.  Has anyone had issues like this?  Cobb County, GA by the way if you have direct knowledge.