Once again Bungie did not properly code the drops in the Kings Fall Raid to be sent to the postmaster when you have a full inventory. Trials of Osiris had the same problem for the emblems you received with a full inventory. I had a Titan class item drop for me during the raid but when I went to the postmaster to pick it up it was not there!!! Please bump and like so others don't end up in my situation and potentially lose something more valuable!!!
Update: A few days ago I checked further into the item issue and it turned out the items dropped are actually quest items sorry for any confusion this may have caused by me not updating this post