the absence of the “words of jeremiah” notice in the lxx version of Seraiah's colophon has contributed to the view that the MT position of this notice obtained only secondarily, added at a time of the MT's growth subsequent to the emergence of the LXX corpus. According to this model, Seraiah's reediting of an earlier corpus involved his moving his colophon to the end of the work, along with the OAN, and then adding the words of Jeremiah notice, closing the early MT version of the book. The appearance of the words of Jeremiah in MT Jer 51:64 provides a very neat closure to the collection beginning with the identical phraseology in Jer 1:1, but it would not have been the result of Seraiah's editing of an earlier LXX corpus that already included the Supplement. Rather, it would have arisen from the development of an early version of Jeremiah 1–25+OAN that the author of the Supplement inherited.

The inclusio device one finds in the MT version of Jer 1:1 and 51:64 is already put to use extensively in the early layers of the Jeremianic corpus, and would have been readily deployed when the basic theme of the prophet's words had been proved true and his oracles were collected sometime after the deportation of 597 BCE. The words of Jeremiah notice would have been at the end of the early OAN collection that included Seraiah's colophon.