I went to the irazur tomb in the desert. I worked my way through the Dungeon to the room with the large chest and sarcophagus. At first the codex and axe were right there in the chest but I was out of room in my inventory so I didn't pick them up. I used a scroll to go back to new garand to unload my inventory. I went back to the irazur tomb, back to the room, back to the chest. The codex and executioners axe are gone
! It's too later to back pedal now because I slept in town and it auto saved along with my own quick save.