Well, I didn't mean to imply that I asked every single NPC - hence the word "seems". As the quest requires I get these from someone, I'm pretty sure that there is at least one other NPC who knows what they are. The problem is, the hint as to who that NPC is was also less than ideal in terms of clarity.
With that being said, confirmation that some other NPC knows is encouraging. Perhaps I let myself be led off in the wrong direction. I'll redouble my efforts and try again. (Perhaps spending 2 hours with Zak in the dungeons beneath Hydlaa has me a bit frazzled. I apologize if I came across as pessimistic or anything.)
Thanks.