I have all the pieces of Lore for the Presage mission, yet I cannot get that final hidden cache (the pad behind the unknown guardian.) I've been doing this pretty much every week for what seems like forever now, getting kinda bored running it now! Can anyone help as to why this isn't dropping for me? It's says the triumph will be unavailable at the end of this season (15) !!!! Thanks in advance, {aB;}