The archive software keeps two names for an attachment. The display title is what readers see in a thread. The original file label is stored in a data attribute so changing a title does not break a filing reference.
<article class="attachment" data-file="beneficial-owner">
This is a transcription of the relevant HTML. There is no additional information hidden in the software. The file label names a kind of ownership, rather than the person who happened to sign for the van.
Notebook question: What is the attachment’s original file label?
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Retained correspondence · Paperwork trail · Accession copy, not a new event