Well, the Bricklink inventory states it has only been released in:
- Dark Blue
- Dark Red
- Dark Green
- Dark Flesh
- Flat Dark Gold
The Bricklink inventory states that the piece only appears in 10 sets which out of these then I own 8 of them and I can for sure say that none of the sets has them in Light grey. As for the other 2 sets I don't have they are supplementary canisters with an assortment of parts already made and shouldn't include any special recolours of any piece.
So I will still say without a shadow of a doubt that this piece is fake.