'WHAT we'd like to know is where all the balls have gone,' said an Australian breeder at Hong Kong's first ever horse auction. The mystery of the lost testicles will haunt the Australian horse suppliers. When they left Australia, the breeders swear the 24 steeds had 46 testicles between them - one having already been separated from his. But on arrival in Hong Kong, five of them had lost one each. Well, not exactly lost, merely hidden. The excuse being given is the trauma of the flight. So men returning to Australia for Christmas, there is more to worry about than pins and needles in your feet.