You win, they are totally transparant and when Janet Yellen warns congress not to increase oversight she is just kidding.
They are a lot more transparent than you give them credit for. Every Fed bank is audited annually by an internal audit staff and an external auditor like PwC or KPMG. Every bank files reports with the Treasury and Congress. The minutes from every meeting of the Board of Governors or the FOMC is available to the public. But you're right. All that just must mean something is going on behind the scenes.