Drop the shipping document you received. Its fingerprint is calculated here, on your device — the file is never uploaded, never sent anywhere.
A match means the file you hold is byte-for-byte the one registered when the shipment was declared. Nobody has altered it, replaced it, or sent you an older version.
It does not certify that the document is authentic, nor that the goods have actually shipped. It settles which document was presented, and when — the question most letter-of-credit disputes turn on.