So I would add another:
Put the ruddy cache back where you found it! Not a foot away, not in another hole that you think suits it better. WHERE YOU FOUND IT!
Dartymoor I couldnt agree more I am getting a little fed up visiting some of my caches after a few DNF. Look around and unable to find my own cache so assume its gone walkies. I place another and then down the line someone logs a find on two caches at the GZ.
Another one to add which I had happen to me recently:
A cacher deciding that as they couldnt find the cache means the cache is missing and replacing it with a different container, missing bonus information in the log without contacting the CO in advance.