Looks like there was a change to The Black Series Snowtrooper #35 figure. Early versions with date stamp 62571 have dull white Helmets, Chest and other armor pieces. While figures with date stamps 62701 have very shiny glossy Helmets, Chest and other armor pieces. I have multiple of each versions bought from different sources, so they are out there.
I did take a quick comparison photo (Dull on the left, shiny on the right) which you can see the differences, but maybe not as much as when you have them side by side in hand due to the bright lighting used.