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( quoting myself)
my guess , probably totally wrong
could it be a treasure hunt amongst the posts. A way of members giving the boolean search a good test and using clues as key words in the four areas to find posts that SO has edited with pictures of the rings. you would have to post all four post numbers to win the prize whatever it may be.
It's just a guess but if I'm wrong it would be kind of fun if something like that could happen.