CWL----For Gettysburg, Is the Army of Northern Virginia Represented in the Official Records?

Happily perusing Benjamin Dixon's new Learning The Battle of Gettysburg: A Guide to the Official Records, I asked "For Gettysburg, Is the Army of Northern Virginia Represented in the Official Records?" The answer was found on pages 136-144. Of what I found this is a summary of Army of Northern Virginia's Reports in the OR:

Of three infantry corps, all three corps reports are missing.

Of the auxiliary corps (artillery, ordinance, cavalry) there are
two of three are there with the cavalry report missing. Did Lee
possibly
command the cavalry corps while Stuart and his division were away?

Of the First Corps divisional (infantry/artillery) reports, all of
Longstreet's divisional reports are missing.
Of the First Corps' 15 brigade reports, 14 are missing.

Of the Second Corps 4 divisional (infantry/artillery) reports,
there are zero missing.
Of the Second Corps 18 brigade reports, only one is missing.

Of the Third Corps 4 divisional reports, none are missing
Of the Third Corps 18 brigade reports, only one is missing.

Why does the First Corps have all these missing reports?

NOTE CORRECTION TO THIS POSTING: MAY 23, 2008.