If international mail you sent from Japan has not arrived, first identify the postal service and posting date. Japan Post lists a six-month inquiry period, counted from the day after posting, for registered, insured and International Air Packet items and generally for parcels. EMS is different: check the destination’s conditions. Do not assume every international item has the same deadline. Japan Post: Inquiry Request Form
Match the deadline to the service
The official inquiry page lists registered, insured and Air Packet items, international parcels, and EMS as eligible categories. Its parcel rule includes a one-year exception for South Africa; it also says inquiries about parcels sent from South Africa cannot be accepted. Some destinations do not accept inquiry requests. Japan Post: periods and exceptions
For EMS, follow the link to Japan Post’s International Mail Conditions List and select the actual destination. The list is in Japanese. This guide does not substitute a guessed deadline for a country you have not checked.
An inquiry deadline is a limit for requesting an investigation. It is not a recommended waiting period. Write down the posting date now, even if you are still checking the latest tracking event.
Prepare the records for the original post office
For mail sent abroad, Japan Post directs the inquiry to the post office where it was posted and says it cannot accept inquiries by phone. The listed documents include identification and the relevant posting records. Japan Post: where to apply and documents
| Outgoing service | Posting records listed alongside ID |
|---|---|
| Registered, insured or International Air Packet | International-mail receipt |
| International parcel | Acceptance receipt and sender's copy |
| EMS | Acceptance receipt and sender's copy |
The official page provides the inquiry request form. Keep the service name visible when collecting your documents; a seller’s order confirmation is not automatically the postal receipt named in the instructions.
The sources checked do not establish what will be accepted if your receipt is missing. Ask about that specific problem instead of creating a replacement document that looks like an original.
A hypothetical sender with an approaching deadline
Suppose you posted an eligible registered international item five months ago. The recipient still has not received it, and you have the original receipt. “The general period is six months” is not a reason to postpone preparation for another month.
Put four facts together: the service on the receipt, the posting date, the destination, and the office that accepted it. Then check destination restrictions and take those records to the original office. If the service turns out to be EMS, return to the destination-specific rule rather than using the registered-mail assumption.
This example deliberately does not calculate a last calendar date. It illustrates why the starting facts must be correct before anyone relies on a deadline.
Keep the inquiry separate from the outcome
For your own notes, record what is known and what remains uncertain. “Tracking has no later event” and “the recipient reports non-receipt” describe observations. They do not, by themselves, establish where the item is or whether compensation will be paid.
After applying, retain any case details the post office gives you. An investigation request is a request to establish what happened, not a guarantee of recovery, a delivery promise or a compensation decision.
This guide is desk research on Japan Post’s public instructions. No inquiry was submitted, and no processing time was tested. Domestic ordinary mail and items that have already been returned involve different questions; use the international service and destination rules for this request.