the missle you just have to check the chest while avoiding the missile and for the bomb I'll have to check but I think its that you have to check the chest and get it right before the timer runs out.
i think the missle y0u have to check if the chain moves
no, you check the whole chest, there could be other things that are off instead of the chain.
so far ive only seen one wrong or right if they mess with chain idk tho maybe just lucky