Subject to the provisions of this paragraph no dynamite shall be permitted to remain in the Magazine for a longer period than 2 years.
However, where—
(a) sales of dynamite as provided for in Part 1 of this Order have not been successful; or
(b) dynamite has in the opinion of the Commissioner of Police begun to deteriorate before such period of 2 years has elapsed it is lawful for the Commissioner of Police to cause the same to be destroyed and the rent due on the same at the time of destruction, the expenses attendant thereon is recoverable as a debt from the importer.