FIRMS code

M277 PROPPER INTERNATIONAL INC

Deleted Importer's premises

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: M277
Name: PROPPER INTERNATIONAL INC
Address: ROAD 114 ZONA INDUSTRIAL
MAYAGUEZ, PR 00709
Status: Deleted (D)
Facility type: Importer's premises (06)
CBP port: Mayaguez, PR (4907)
CBP region: 4
Last changed: 2026-10-23
Data as of: 2026-10-23

Pre-filing validation

Validate M277 before you file

Validation fails M277: 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":"M277","port":"4907","use":"location_of_goods"}'

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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.