There is a 30 or 60 day window to challenge the Conservatorship in HERA and that would likely prevent the filing of a lawsuit challenging the inception of the 14+ year CONservatorship.
Once fraud is discovered, I believe that generally Plaintiffs have a "reasonable amount of time" once the fraud is revealed.
Another problem is that so much of the Smoking Gun Evidence that the Plaintiff Shareholders need to adequately proceed is excluded from trial due to the "Executive Privilege" and "National Security" exemptions.
Look at all the Smoking Guns excluded from Evidence and the Jury in Lamberth's trial.
Lamberth even quipped to the Gubmint lawyers (Arnold and Porter) about this problem when they tried to limit the Plaintiff Shareholders arguing a certain way during Motions in Limine.
not what I recall but I admit I did not study in depth
my understanding --- or propaganda I believe ---- is that like other financial instruments - especially MBS paper --- the marketable value in 2008 plummeted
on a mark to market basis - things were beginning to look scary
as I recall - here and many banks - there was an honest and intense debate on the logic and value of mark to market but it is GAAP