Yes, you do.
You should have started a new thread for this, but anyway–
1. Cuiviénen no longer exists by the Third Age.
Quote:
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In the changes of the world the shapes of lands and of seas have been broken and remade; rivers have not kept their courses, neither have mountains remained steadfast; and to Cuiviénen there is no returning.
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The Silmarillion, "Of the Coming of the Elves".
2. What became of the Blue Wizards? Nobody knows... not even the author.
Quote:
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...and whether they remained in the East, pursuing there the purposes for which they were sent; or perished; or as some hold were ensnared by Sauron and became his servants, is not now known.
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–
Unfinished Tales, "The Istari".