Witness
Sifrei Aggadah on Esther: Midrash Panim Acherim, Version I
Parallels (4)
Haman's letter opens with his own self-titulature -- 'the great one of the king and second to him, head of the prefects' -- directly matching Addition B's presentation of Haman as holder of the second place of honor, a specific and distinctive detail MT never supplies.
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The crisis is diagnosed as punishment for the specific, named sin of eating at the gentile king's table -- matching Addition C's confession 'we have sinned before you... because we glorified their gods' as a specific sin-and-deserved-punishment frame MT does not supply.
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Haman's own titulature -- 'the great one of the king and second to him, head of the prefects, choicest of the nobles' -- matches Addition E's description of him as 'paid homage by all, second to the royal throne,' a specific and distinctive shared detail.
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God specifically 'breaks the seals and tears up Haman's written letters, annulling the decree' -- the same concrete act of voiding Haman's letters that Addition E's royal rescript performs, a specific narrative action MT does not supply (MT merely issues a counter-decree, without describing the physical undoing of Haman's letters).