I have pulled both kinds from each type of box.
Edit: I was curious about the Black/Grey thing so I checked Pokémon.com
Just take a look at the scan they have...
So...what really is the error? Black? Grey?
lol. HOW MANY VARIATIONS OF THIS THING IS THERE!? *dies*LOL! That's neither. That's the dark gray one.
We may just have to play the waiting game on this one.
Obviously the error has been recognised and corrected, so we just need to see which one sticks around in the long run.
Eventually we will get to a point where later print runs are all people can find, and everyone is pulling one version and not the other. The one still being pulled is the corrected version.