When you say 'avenged', I assume you mean 'later found'.
Personally I'm not sure what use this would serve. There are many caches I've logged as a DNF that I'm unlikely to go back to. Equally, there's a few that I DNF'd more than once or twice before finding it.
Some people simply don't log DNFs at all. Because of this, there wouldn't be much use for comparison stats, because there'd be no guarantee they're correct.
Also, what would happen if you'd DNF'd it and it was then archived?
Personally, I prefer to see the stats for caches which I've found, rather than those I haven't, but that might just be me. :)