Board Thread:Speculation House/@comment-124.177.133.112-20151118020312/@comment-3387274-20151125222221

It's also been confirmed that it's not so good against groups of Grimm, at least not in the same way Coco's gun is. That is to say, Coco had the better weapon for the situation in which she used it, out of those two.

Another thing to note is that the design of the box has changed since the production diary, and the opening now appears to be on the bottom. The impression I get is that, much like Coco's weapon, the box actually transforms into the weapon in some way, or at least that the two are connected and fold around each other somehow.