I don’t know about that....
There is a column in the spreadsheet titled “formerly”,
and then classifications such as “redacted”, “released” “withhold”.
Looked at one, and wonder if many will be photocopies of records and memos, thus making search a chore...
but there is a column for TO: and FROM: which should be of big help.
I hope you’re right. It’s been sixty years. Well, fifty-nine, but still...