Where do I find PCH sweepstakes unclaimed prizes and who is awarded them
You could try their website, blog.pch.com. This is where they announce all their winners and where you can base your query to get an answer. You can also visit http://contests.about.com/b/2012/12/01/a-new-publishers-clearing-house-winner-will-be-announced-soon.htm for more information.
Try their website. Good luck, hope you find out you won something.