Step 1. File a police report
Visit the nearest police station (交番 koban) or tourist police center and get a written lost-property report before heading to the embassy.
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Step 2. Contact your embassy
Call ahead if possible. Many consular teams will tell you exactly which photos, forms, and flight proof to bring.
Step 3. Prepare airport fallback
If your flight is imminent, check whether your embassy and the airport consular desk can coordinate an emergency document path.
Embassy quick lookup
United States
Akasaka, Minato-ku, Tokyo
03-3224-5000
Bring police report, photos, and any ID copies you still have.
Airport contingency
For imminent departures, confirm whether your airline, embassy, and Narita/Haneda Airport consular help desk can work with an emergency travel document.