You guys are approaching this very 'single minded', I must say. Let's consider the environment these ships operate in...now without atmosphere to slow'm down, any little particle or enemy fire that impacts with a ship (whenever it may happen, it will happen) will have the effect of sandpaper on paint. Accepting that this 'spacedust' will be far between and small, this will not cause visible surface wear and tear, but it will take away that high-polished look real quick...it will still reflect, but not as if it's a smooth polished surface, but much more like a highly satin-gloss surface...
You can even see this effect on cars...the front window of a showroom new car reflects much more 'polished' than from a car that's over 5yrs old.
Now, in your last pics, the sun hilite on the cockpit looks soft blurred, exactly the effect you would expect from a space exposed surface, yet the nebulae reflects off of it like from a mirror...In all honesty...I'd sooner accept it 'as real' if both the reflection and the sun highlite where a bit 'out of focus'.

edit: you beat me to it, no wonder it looked different...
