There's two of them. No, really - check the base.
The Silver parts started out exactly as all the black parts, so to save time I painted them all at once. The difference is that the highlights cover more of an area on the silver parts than they do on the black parts.
So they all started base-coated black. The next color is VMC Black Grey 168, then Dark Grey 166, Neutral Grey 160, and finally White.
The silver parts then got glazed with a mix of VGC Turquoise and P3 Cygnar Blue Base.
For quick, small detail bits of silver, like belt buckles and things I may have missed until the final detailing stage, I started with VGC Sombre Grey, and highlighted with Wolf Grey and White. If the bits were big enough, they got the Turquoise/Blue glaze, and a little shadow with black (or at least black lining).