Have you found the ornaments?

[Toxo]

Originally Posted by sethmage

Do another fly by and look for the red dots, it is possible that mob might re-spawn, I thought I killed everything, but after killing Arthur, I had couple mobs in the area that I’m 100% sure I cleared before.

I had the exact same thing - places that I absolutely know I visited and cleared out before, suddenly had new enemies to slay. One of them ended up giving me the last item.