Arenanet has confirmed that Fractal Weapon skin box mentioned in the Fractured patch is not currently available until Fractal levels increase beyond 50. The Fractal Weapon skin box would allow you to pick any fractal skin you liked.
This is not considered a bug.
The Fractal Skin Box is not dropping for the Fractal levels currently available (up to level 50).
It’s not accessible to anyone at this time.