Or rather the game did flash me as receiving the weapon (and the catalyst for some reason, though i can't find that either) on the right of the screen but i don't have it on me and it's not unlocked in collections. I did get the "while whisper of the worms is equipped" followups from Eris Morn. But it's mildly difficult to do them without the sniper rifle. :/ Please help. :( /edit: oh almost forgot, yes i checked the postmaster. :)