“調査中 (Investigation underway)”Normalized: exception (Needs attention)Yamato Transport (Kuroneko) (yamato)Sagawa Express (sagawa)Japan Post (japanpost)

What Yamato Transport '調査中 (Investigation underway)' means.

Yamato Transport (Kuroneko Yamato) in Japan has paused your TA-Q-BIN parcel (`調査中`) because the shipping address is incomplete/missing an apartment number, or the parcel was accidentally routed to the wrong local branch.

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What is happening in the supply chain

In Yamato Transport's Kuroneko tracking system, `調査中` ('Investigation underway') is logged for two distinct reasons: (1) **Address discrepancy (`宛先不明`)**—the local Yamato sales office (`営業所`) found that the building name, room number (`部屋番号`), or postal code does not match the resident's nameplate (`表札`), or (2) **Mis-sort correction**—the parcel arrived at the wrong neighborhood Yamato center and is being re-routed to the correct branch on the next shuttle.

92… USPS Awaiting Item Checker →
Verbatim carrier scan
“調査中 (Investigation underway)”
Normalized API status
exception
Typical time to delivery
Action required (or resolved within 24 hours if sorted to wrong depot)
Recommended recipient action
If the status stays on `調査中` for more than a few hours, call or use the Kuroneko Members web form for the Yamato sales office (`担当営業所`) listed on your tracking page to confirm your exact address and room number.
Developer / WISMO action
Call GET /v1/track/{number}?carrier=yamato to detect `調査中` exceptions immediately and verify the Japanese recipient's chome-banchi-go and apartment number.

How lastscanned normalizes this scan

Instead of maintaining brittle regexes for every carrier's raw scan phrasing across 273 carriers, query GET /v1/track/{number} or connect https://mcp.lastscanned.com.

Get an API keyYamato Transport (Kuroneko) API docs

Synchronous GET request

curl "https://api.lastscanned.com/v1/track/491827364512" \
  -H "Authorization: Bearer lsk_live_YOUR_API_KEY"

Normalized JSON response

{
  "carrier": "yamato",
  "trackingNumber": "491827364512",
  "status": "exception",
  "statusDescription": "調査中 (Investigation underway)",
  "message": "調査中 (Investigation underway)",
  "events": [
    {
      "timestamp": "2026-10-26T14:22:00Z",
      "localTime": "2026-10-26T10:22:00",
      "status": "exception",
      "description": "調査中 (Investigation underway)",
      "location": "TOKYO / OSAKA YAMATO BASE, JP"
    }
  ]
}

Frequently asked questions

Does '調査中 (Investigation underway)' mean my Yamato package is lost?
Almost never! In Japan, Yamato uses `調査中` whenever a driver cannot confirm the apartment/room number (`部屋番号`) or surname on the mailbox, or when a parcel is being transferred between adjacent neighborhood branches.
How do I fix a Yamato Transport `調査中` status in Japan?
Check the name of the local branch (`担当店名`) shown next to the `調査中` scan and submit an address confirmation online via Kuroneko Members or call Yamato customer service with your 12-digit slip number.

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