The dealer probably repainted the lower doors when it arrived at the dealer with some minor damage. But they don't disclose this information to the customers.
That's why you have rust now. That's why my car has some rust spots too, becasue the dealer did a poor job in repainting some minor damage.
========= Harryface =========
1991 Pontiac Bonneville LE ~_~_~259,100 miles_~_~~_