Okay Eragon losing the belt is one of the most frustrating question left unanswered in my opinion. For the life of me I can't imagine where and how that belt went, all my theorys are pretty outlandish e.g: It ran away when under threat? any ideas people help a confused guy out!

Well the elves said it had been lost many times before, mayby CP might bring it back in whatever future books he reffered to writing. Such a shame it will be years before we get any semblance of an answer!

Is that the ones who saves roran outside Ilirea?

I do not think Eragon will ever get the Belt back. When he lost it, he said that he missed it not for its incredible amount of power or its rareness, but because it was symbolic for all the deaths of animals it held. He had to lose it, otherwise those deaths would impact his entire life forever. For a reference, in Harry Potter and the Deathly Hallows, Harry loses his Firebolt and Hedwig. These are symbolic because it is Harry losing his childhood; he is moving on.

For the whereabouts, I suppose the nomads could find it. I also do not think it had substantial power stored within it, so I do not think it will be a threat.

There is magic placed upon the Belt that prevents it from being scryed on. I think this was placed (as well as many other protective charms) by Beloth. I think Eragon has placed some but not many. He can't find it - and I do not think it is that important.

I don't think we are ever going to get a concrete answer there's just too much that "could" have happened. I think that all we an count on is that it will be a big part of a story that is yet to be written.

im with you on that. just makes the most sense and seems the most strait forward and logical answer.

Well Eragon knew the name of the ancient language when he came back to look. He should of been able to remove any spells on it or he probally could of done something really kool and some how magiclly made it come to him.

Couldn't Eragon use the Word to bypass the wards on the Belt and find it?