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.

If in the US south-east, you should return the passport to:

The Consulate General of Ireland,
3414 Peachtree Rd NE, Suite 260,
Atlanta, GA 30326.
Tel. No.: +1-404-554-4980