Well, if you look at actual stills, promo, and behind the scenes photos you'll see all stormtrooper's armor is weathered and beat up. In all three OT films. Granted it's mostly wear, tear, and scuffs from the rigors of filming. But perfectly clean and shiny they most certainly are not.
I recently built a bandai 1/12 stormtrooper that replicated the "shiny ANH" look with screen accurate weathering. Up close you can see how rough and "used" the armor is, but from even just a foot or two away he looks all shiny and new and the weathering blends in to almost be unnoticeable. I'm sure this will be similar. Up close you'll see it clearly. On the shelf from a few feet away he'll look crisp and shiny.