First, Neebos the person that gives back a pack with the same name is Lady Adrecia with the Glowing Dragon Pack, not Lady Rosaline with the Shimmering Dragon Pack.
Second, the only time that I've had problems with a quest giver not taking my items is when I didn't have all of the 'flags' from beforehand. This was in the case of the Newport rings, I forgot to talk to some people. Reading over the Ytraz quest though, I can't see how this could be the case.