Lost the emblem before I manage my postmaster got to excited just thinking about getting and now it's gone. It doesn't exist in my flairs or recent collections. Not sure how to fix it or reset the reward, but I hope bungie would catch wind of this. I even easily grinded bookworm one.
It doesn't go to postmater. All emblems go straight to your collection but don't always appear quickly and you have to close D2 for it to appear.