The bill of lading is the central document of maritime trade. It performs three jobs at once: receipt, contract of carriage, and, when made out to order, title. Because it is title, whoever holds it can claim the cargo, and banks lend against it.
That combination makes it the highest-value document to falsify. A bill that describes cargo never loaded, names a vessel that was not in port, or is presented twice for the same consignment, will support a payment before anyone inspects a container. Verification against the carrier’s own records, rather than examination of the document, is what catches it.