@grapejelly_ch After re-reading S.E.A and Molar Office - the explanation that they were too no-name or unofficial is unlikely. However, Vergil does mention that they are returned from the books to the silence of Faust.
It might just be a writing oversight or mistranslation/poor wording.
@grapejelly_ch It could largely be oversight why Faust did not recognise Molar Office as survivors. Alternatively - Molar office were not expected to go to the library bar a personal request from Myo and have nothing really to say about it either. Faust only knows what faust knows afterall.