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Lonelycache.com - a website to look up the least-often-found caches in any US county!
(www.lonelycache.com)
For example, this Traditional in Idaho has only been found once in all its 20 years.
The website uses a points system based on cache age and number of finds to determine a cache's score
That's an interesting site.
Several of the long-unfound caches in my area appear to be gone, and the listings in need of retirement. They were placed along riverbanks and likely washed away or were covered by mud years ago.