{
  "id": "M5",
  "subject_contains": "新增预报",
  "mail_type": "NEW_CONTAINER",
  "container_no": "MATU2745683",
  "shipments_expected": 327,
  "importable": true,
  "gate": "上线门禁：主题含新增预报 + 卡派清单，无需 Admin 改类型",
  "header_expected": {
    "F_CabinetType": "40HQ",
    "F_ETA": "2026-08-15",
    "F_ETD": "2026-07-20",
    "F_LoadPort": "上海",
    "F_Dock": "洋山",
    "F_BLCopyCode": "BLMATU2745683",
    "shipping_line_hint": "MSC"
  },
  "sample_rows": [
    { "F_FBACode": "ABQ2", "F_Transporter": "TRUCK", "F_CTNS": 1 },
    { "F_FBACode": "FTW1", "F_Transporter": "TRUCK", "F_CTNS": 4 }
  ]
}