FIRMS code

K840 DETROIT DUTY FREE

Deleted Bonded warehouse

This code is deleted in CBP's FIRMS list. Don't use it on new filings. FIRMSapi keeps deleted codes so lookups of old paperwork still resolve; check the port listing for a replacement.

Facility details

FIRMS code: K840
Name: DETROIT DUTY FREE
Address: 30000 Northline Rd, Detroit Metropolitan Airport, Bldg 407
Detroit, MI 48242-1806
Status: Deleted (D)
Facility type: Bonded warehouse (04)
CBP port: Detroit Metro Airport, Detroit, MI (3807)
CBP region: 3
Last changed: 2026-10-23
Data as of: 2026-10-23

Pre-filing validation

Validate K840 before you file

Validation fails K840: it's deleted, the reject ACE returns as 159. Search the port for an active replacement.

curl https://api.firmsapi.com/v1/validate \
  -H "x-api-key: $FIRMSAPI_KEY" -H "content-type: application/json" \
  -d '{"code":"K840","port":"3807","use":"warehouse_entry"}'

Get a free key Validation guide

Source: U.S. Customs and Border Protection FIRMS code list, data as of 2026-10-23. FIRMSapi is not affiliated with CBP; confirm bond status and filing details in ACE.