Unfortunatelly if you didn't find any google hint about the quest is a big risk. ... I picked up the quest again, received the itens and finished. But there's this guy on the other thread that is having a little problem, he gave up of some quest and seem not able to get the necessary item again. So the suggestion is, in doubt keep them, or try a little harder in your google research.
I can't find a quest for them to give up in my quest tracker either. Should have mentioned this. I
THINK the quest chain is over, but it is hard to tell. I have another character where I did delete an item and now I can not get it back and support isn't (e.g. non-support), all they told me to do is to go back and talk to an NPC who won't talk to me. However, that is another story.
Thanks for your input Murkalael.