OK, if we forget about the number of caches that people have found would it still be possible to show information on the site showing which caches are still not found.
All that I can find is this:
As of today, there are 63160 active caches in 183 countries.
In the last 7 days, there have been 37569 new logs written by 9128 account holders.
Now of those 63160 caches which ones are still not found and in particular which is the oldest that is still not found. International travel is common these days and people are not only interested in finding out about the caches in their region. All that we would need is a top 10 or even top 100 list showing the oldest unfound caches.