Those are never going to come out. The only way they become a legal issue is in criminal trials against non-government shooters, and those trials will only reveal the dead who were killed by non-government shooters.
The government can pretend that all the dead were shot by bikers, and claim that there are no trials, because it would be too hard to prove who shot who - if there is no trial, the evidence stays buried forever.
You don't REALLY believe they would be that audacious, do you?
“The government can pretend that all the dead were shot by bikers”
Eventually the congresscritters will get a whiff of this thing. There will be hearings, TV coverage, fingers pointed, tisk tisking to be done. The three trigger pullers will do some time in a Club Fed.