Custom and Border Protection relies upon CBP Form 7501 "Entry Summary" to determine relevant information (e.g., appraisement, classification, origin, etc.) regarding the imported commodity.
CBP Form 7501 "Entry Summary" Instructions: Detailed instructions on completing CBP Form 7501.
3550-055 Instructions for Deriving Manufacturer/Shipper Identification Code: Instructions on calculating the manufacturer identification number. See also 19 CFR at Part 102 and CBP Form 7501 Instructions.