I see RPO code B86, that's body side molding- color. Our Silverado truck has B96, which lists the moldings as "Bright" for chrome. So it looks like someone put your truck under the knife at some point.
Although further look into the RPO's shows:
B30 CARPET,FLOOR AND WHEELHOUSE
VK3 LICENSE PLATE,FRONT MOUNTING PACKAGE
V22 GRILLE,RADIATOR(CHROME)
Can't find anything for RSA, R8W, R9A, SLM or VXS.
So I'd say someone put the bright trim on it and changed the front bumper- I don't see the bracket or the holes and the notches in the rub strip for it. Although I don't remember a chrome grille on the base trucks with glass headlights. Perhaps another member could chime in to let us know if the uplevel grille was indeed possible on a base level truck.