So it’s safe to say that any “loose ends” we may come across are intended for future tales? Such as, perhaps, the belt of Beloth the Wise?
Christopher Paolini: Possibly. The problem is, there are always loose ends. If I write another story, it’ll probably raise as many questions as it answers. Still, yes, the belt of Beloth the Wise will pop up again somewhere else. Personally, my favorite theory is that Angela swiped it in Dras-Leona. But then again, I can’t imagine she would have done anything to harm Eragon’s chances of killing Galbatorix.
Shurtagal.com's first post-Inheritance interview with Christopher Paolini, December 2011
So what became of the belt of Beloth the Wise?
Christopher Paolini: Heh. Book V.
Twitter AMA October 2012
Where did the belt of Beloth the Wise go?
Christopher Paolini: Great question. No comment.
Is it potentially important? ‘Pay attention to it, readers,’ type thing?
Christopher Paolini: Well it’s not unimportant. I mean, a big magical artifact suddenly disappearing for a while, that’s cause for concern, yes.
Well you say “for a while,” so it might reappear at some point.
Christopher Paolini: That’s right, it might.
Shurtagal.com's second post-Inheritance interview with Christopher Paolini, January 2013
What happen with the belt of Beloth the Wise?
Christopher Paolini: Good question.
Twitter June 2015
Since Bregan could see Murtagh’s eldunari and the belt of Beloth the wise…could he possibly find the belt?
Christopher Paolini: Yup.
Twitter December 2015
Eragon used the Name of Names trying to find [the belt], if I recall correctly, so do we assume that it's been destroyed?
Christopher Paolini: Never assume anything.
Facebook AMA February 2017