In 1969, I recall a C130 landing at Fairford after a flight from Gibraltar and the aircraft's captain ordering every piece of freight to be re-weighed.
The vast majority of the cargo consisted of the PE's of a 1* Army officer. Quite a lot of the wooden crates were marked with a weight of 273lbs - which was the limit for PE boxes at the time. These large wooden crates took five of us to lift, never mind carry, (the aircraft was in clean floor fit) and were conveyed to the cargo shed where they were put on the scales. The aircraft captain logged the individual weights which showed that the total weight of the load was far in excess of the manifested weight.
Our resident customs officer was also present and he ordered all the crates to be opened when the contents of the overweight crates were revealed as rocks and stones of various colours and shapes. The cases also contained articles which attracted the attention of the customs officer, who impounded them in his own lock-up.
Another member of this forum was on a Fairford squadron at the time and he may recall this incident.