Retain all three documents. Mark the two summaries as dependent accounts. Do not delete the circular citations: the loop is itself useful evidence of how the same claim acquired the appearance of several witnesses.
The receiving register is not complete. It identifies a consignment and a custodian, not the ultimate owner. That omission is the reason the correspondence continues. It is also the reason this office has stopped using the word “definitive” in headings.
Notebook question: Which register is the first-hand source rather than a circular citation?
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Retained correspondence · Paperwork trail · Accession copy, not a new event