??
It's not feasible to produce documents on individuals who have been arrested/detained by the federal government, processed as arrestees/detainees of the federal government - which means that comprehensive information was collected about them - and imprisoned by the federal government?
In other words, is the US Attorney saying that the federal government (a) has no idea whom it's arrested/detained, (b) has no idea whom it's processed as an arrestee/detainee, (c) has no idea whom it has locked up in federal prisons/detainment centers?
Isn't that the definition of a "disappeared" - the term the Argentines used to refer to those people who were arrested and then simply disappeared into the Argentine police state, never to be heard from again.
And there are still those who are willing to defend the federal "justice" system as run by, and mostly populated by, individuals of impeccable good will and good judgment who scrupulously follow the Constitution and the law, and respect the rights of those whom they've arrested?