Import manifest compliance governs unloading of imported goods at customs stations, subject to proper officer permission. Imported goods required to be mentioned in the relevant arrival manifest, import manifest, or import report may not be unloaded at a customs station unless they are specified for unloading in that document. Unloading of such goods is permitted only with the permission of the proper officer. The provision regulates the handling of imported cargo at customs stations by linking unloading to prior declaration and customs control.