Why the documents needed to check wartime memoirs remain unavailable

Are the documents unavailable because they have not been declassified, or because they no longer exist?

Both are possible: some records appear lost, while others may have been destroyed, misplaced, or kept closed under long release restrictions.

Several explanations are offered for the documents that cannot be consulted to check R. V. Jones's account. Some appear to have been lost, while misplacement or destruction remains possible. Other records may still await release. A hypothetical example illustrates how a restriction tied to the death of a young participant could keep wartime material closed for decades beyond the participant's working life. The absence of records therefore does not have one established explanation.