I'm tending towards 4 being about the right number. That would include needs archived logs, BTW.
5 DNF's and a find is not particularly unusual, but after 5 DNF's and no "maintained" by the owner, one could wonder whether it has been abandoned. It may still be there, but the percentages are with it having gone missing.
Remember at GCA, all you would need to do it edit the cache, reactivate it and put through a "maintained" log. There is no need for anyone else to get involved. It's all self service stuff.
I am not a big fan of replacing a cache unless the owner has agreed with it being replaced. It perpetuates the problem of abandoned caches.