That said, I disagree with the example you bring up of «the most
prominent ukrainian uploader WoxBox has 441 photos "with identifiers not
in the lists" but it is not true»
You can easily see that he has 441 photos tagged with "{{Monument
Ukraine|0}}", which are those taken as "identifiers not in the lists"

http://toolserver.org/~platonides/wlm/uploads.php?source=commons&author=2271549&country=ua&type=bad

Then you've made a mistake in interface. In the page "http://toolserver.org/~platonides/wlm/users.php" I see the following:






And when I click "перегляд" (overwiev) i don`t see zeros but I see the next: