Hi
The tooltip on the satchel showed some leather items missing, so i ran old dungeons again and again. all the pieces were collected, except the last. When it dropped it was still showing as missing. think i even knew it before just did not really check Appearances window. (i don't know in which category is this item in the ATT window)
Did all the shenanigans, force refresh, restart wow a dozen time.
Edit: got a few more shoulders from the bag, did not help.

i close this because shift+refresh may or may not have fixed it and i am too high level now to get these bags to test .