This is a hard one. I'm torn between 'destroy the box' and 'wait and see'. In character, you learned not so long ago that the Simurgh is capable of slaughtering far more people than she ever has, that she is vastly more powerful than she had previously let on. On the other hand, out of character, we know that she has a goal and that murdering every human of the planet isn't on her to do list.
Of course, when considering, "What's the worst that can happen?" it is likely best to consider that SW used the Hellraiser box for reference in describing it. If Kinrush is right, I would be greatly amused, but a telepathic signal reaching Taylor at night from who knows how far does fit the Simurg's MO. Of course, him being right would mean Cassiel has been lying to us on some level. Alternatively, and I don't recall for certain how certain we are on some of these details, the Simurg might be the one oppressing Cassiel as the being the Fallen worship.
As much as I feel destroying the box is the better idea, curiosity wins out for me, so:
[x] Wait and watch what happens
Also, while it would most likely be suicidally stupid, we don't know in character that Ragnarok wouldn't be sufficient, so I expect to see a couple of votes for that approach.
Edit: Also, why didn't Dragon know that the Simurgh has moved? She keeps a continual watch on the Simurgh while she's in space, so it seems a bit of a surprise that she didn't see her moving. I would expect her alerts for a Simurgh attack to be blaring from the moment the Endbringer moved, under the presumption that this was her moving into position for an attack.