The trail soon led to Halksworth. To his embarrassment, the great forensic scientist was found to have committed a catalogue of elementary mistakes. The bonds were printed with the word "dollar" not "dollars", the cases were made of plastic and the 1934 documents carried postal zipcodes which were not introduced until 1963, and they were printed on an eighties inkjet printer. What is more, how could the bonds represent the credit value of 125,000 tons of gold when investigations revealed that the total amount of gold mined in the world by 1950 was only 63,500 tons?