You would anticipate a lot of confidential supervisory information: the Federal Reserve (and other Federal regulators) inspect banks regularly, and are allowed

You would anticipate a lot of confidential supervisory information: the Federal Reserve (and other Federal regulators) inspect banks regularly, and are allowed to ask for basically anything at all from them. You would expect there to be a significant volume of highly confidential stuff in the working papers. You'd also expect to see potentially embarrassing material for banks like negative supervisory findings, where banks are being asked to deal with things that potentially affect their safety and soundness. This stuff is all highly confidential, for obvious reasons.