I feel for you OG poster but I don't understand - this nebula fragment is eventually converted into a lvl 30 piece of perfected gear - but looking at that perfected gear I am extremely underwhelmed - think about all the time you invested for an item that will not really make your build or you better - I understand the goal sometimes is just to climb the mountain because its there - but this saltmarsh loot/hay/upgrade system is awful. And that lvl 30 piece of perfect junk will be outmoded as soon as they level increase us to 35 or 40 or whatever and there's new junk gear to get - its the MMO hamster wheel, that you upgrade and farm and burn your precious time and then they change the game and you have to do it all again because what was good is now ****.
The most frustrating part of this particular nebula item too is that you cannot start this quest without the nebula fragment - as opposed to the Feywild where you just need to find the feytwisted chests which though rare, pop up now and again.
But even if you found one today these perfected artifacts are no where near good enough to warrant any extra effort -
Still - I feel for you 4000 chests is a lot of farming. Lame that you did not find one.