Likely because you cant restore an Item with Augments. They'd just be able to make an Arka IV poof in your inventory, complete with absolutely no Augments. Pretty simple concept I'm assuming.

You can get your staff back by making a new one, I know its a sad truth but... Just be really careful next time.

Also, Sorry this is a bit of a different attitude towards this, but 6 months? 6 MONTHS? it took me a combined total of 12 hours over the course of 2 weeks (Limited play time) to finish mine. and this was being lazy doing the Fairies... How in gods name did you take 6 months unless you were literally killing 1 mob a day and logging out?