I lost also my old passport but got letter from the German Ministry of Interior (Passport issuing authority in Germany) with list of all my passports ( note was on the letter, this letter is issued regarding application for the Irish Citizenship) Maybe this could be an option for you as I dont know ...

This is the reply I got: Minister for Justice and Equality (Deputy Charles Flanagan): As I advised the Deputy in my response to his recent Parliamentary Question number 130 of 18 January, the granting of Irish citizenship through naturalisation is governed by the provisions of the Irish Nationality ...