In the case of a preference eligible described in
section 2108(3)(C) of this title who has a compensable service-connected disability of 30 percent or more, the appointing authority shall at the same time it notifies the Office under paragraph (1) of this subsection, notify the preference eligible of the proposed passover, of the reasons therefor, and of his right to respond to such reasons to the Office within 15 days of the date of such notification. The Office shall, before completing its review under paragraph (1) of this subsection, require a demonstration by the appointing authority that the passover notification was timely sent to the preference eligible’s last known address.