83. An empty packaging which had previously been used for the transport of radioactive material or nuclear material may be transported as an excepted package provided that:
(a) it is in a well-maintained condition and securely closed;
(b) the outer surface of any uranium or thorium in its structure is covered with an inactive sheath made of metal or some other substantial material;
(c) the level of internal non-fixed contamination does not exceed one hundred times the levels specified in Article 40; and
(d) any labels or placards which may have been displayed on it in compliance with the requirements of Chapter 5 are removed or otherwise rendered invisible.