So I purchased a Destruction Amplification this weekend (took a long weekend) and then, on a subsequent Void Crusade Mission, I looted a Destruction Amplification.
I placed both into my Stasis Casket for later use - perhaps in a dire Crusade moment.
I checked the next day when I logged on & one of them was gone.
It was not used, as there was no counter for the 5 missions.
It was not sold as they were both in the Stasis Casket.