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 lost/stolen passport to the Embassy of Ireland at:

Embassy of Ireland
World Trade Centre 1
L-14
Jl. Jend. Sudirman kav 29-31
Jakarta 12920
Indonesia