Except by special permission, in writing, of an inspector. explosives which have been taken to a working place or have been underground or which are damp, soiled or in any way defective must not be kept in or returned to a magazine, nor must, any damp, soiled or defective package be kept in or returned to a magazine, except that explosives or packages thereof, which have become damp. soiled or defective in transit from the supplier, may be placed temporarily in a magazine to await instructions as to disposal from an inspector to whom the circumstances must be reported immediately by the quickest method.