; (2) the estimated cost savings from the conversions described in paragraph (1)(C); (3) a description of the progress made by the Postal Service toward meeting the requirements of the phaseout under subsection (c); and (4) any other information which the Postal Service considers appropriate. (k) Inspector General audit The Inspector General shall issue an annual audit report on the implementation of this section not later than 90 days after the date on which the Postal Service releases its annual report under subsection (j). Such report shall include— (1) an audit of the data contained in the Postal Service’s report under subsection (j)