What should I do if I find a passport I previously reported lost/stolen?

Never travel on your passport if it has been reported lost or stolen. you run the risk of being stopped at border crossings, as Interpol keeps a record of all reports of lost or stolen passports.

If you are resident in Bulgaria, Georgia or Armenia you should return the passport to the Irish Embassy in Sofia:

Embassy of Ireland
Platinum Business Centre
26 - 30 Bacho Kiro Street
Sofia 1000.