Unlike the index at the end of a book, it (Register) does not contain all the places where the search term is relevant, but often only one and never more than four. Further searches must then simply follow the references accessible from there.
For example, there may be an index entry for the term "system" that refers to only a few places in the box, and then you simply have to see how far you can get from there. This also means that notes and note groups that are not internally referenced can no longer be found, but are simply forgotten. And of course this process of forgetting cannot be controlled at all.
By the way, at the end of our work, there will also be a normal tab for the box, which will also list the previously isolated references.
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NASSEHI, Armin und André KIESERLING, 2019. Zettels Raum. Ein Gespräch mit dem Soziologen André Kieserling über Niklas Luhmanns Zettelkasten. Kursbuch. 2019. Bd. 55, Nr. 199, S. 160–175. DOI 10.5771/0023-5652-2019-199-160, S. 166 – 167.