Impossible to know, really, but some of them are likely motions in which prosecutor and accused set out their respective versions of what the appropriate sentence should be. These often give details like the accused's record in cooperating with the feds & are often sealed until eg indictments arising from this cooperation are handed down by a grand jury.
Obviously, dunno if that's the case here, but no surprise if Matt has been singing like a canary.
News 
Market Data 
Discover 
