These prisoners have also been indexed without the numbers given in this Dachau register page.
examples:
Xawery MRUGOWSKI (number 4501) was in Dachau twice and indexed with his second Dachau number only (see here and comment)
Stanislaw AFFEK (number 4502 in this register page) can indeed be found with this Da. number, but this register page is not shown. (see here)