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=...
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:
Could you fix this? It is expected that link "перегляд" will follow to page http://toolserver.org/~platonides/wlm/uploads.php?source=commons&author=... but not http://toolserver.org/~platonides/wlm/uploads.php?source=commons&author=...
-- З повагою, Андрій Бондаренко