Rivens Stolen By Lich Not Returned

[xxmutationpvpxx]

So i just killed my third Lich successfully, after it stole two rivens from my sortie rewards. Once i finished the mission, the results said i recovered two rifle rivens, however i only ever received one of them. The other was disintegrated or something? Is there any way to recover the other at all? Or is it lost to the void?

[parabashka]

 

[GA30060]

I got mine back after contacting support for a about a week. 

Initially, support wasn't too hot about it. but I just kept on harassing them. and also posting links about other players having the same issue eventually getting their riven back via contacting support