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I will first take a look and second mane a close picture of that.

From memory, it seems that axle ends are plastic with some plated coat that could have been partially lost.

Bad memory.
They are metal. But which one ? The light green color seems to be surface oxidation. That goes away by scratching with a nail. No xidation anywhere else, even on the small axle part visible behind the wheel.
Curiously, I got another Lonestar Cloud with the same thing. But color isn't light green, but just rust. And this Cloud comes from another collection and is mint too, in box.

Sebastian, I sent you a PM.