What do I do if I find a passport I'd 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.

You should return the passport to the Embassy of Ireland at: The Embassy of Ireland, 12^th floor, 208 Wireless Road, Lumphini, Pathumwan, Bangkok 10330.