(3) If, after a vessel or aircraft has obtained clearance but before it has left Saint Lucia, it is discovered that any goods cleared for exportation or for use as stores are no longer on board, then, unless those goods have been unloaded with the permission of the proper officer, or are stores which could reasonably have been consumed since the granting of the clearance, the master or the commander—
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(a) shall pay to the Comptroller the duty on that deficiency; and
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(b) commits an offence.