TWO salesmen who cheated suppliers out of thousands of pairs of shoes worth about $1.1 million were yesterday given prison terms of two years and nine months, and three years. To Siu-wa and Hung Siu-fung, both 31, had denied a charge of conspiring to obtain property by deception, but were found guilty by Judge Hartmann in the District Court. The court heard that a co-conspirator Yau Koon-yau, who has already been jailed for 2 1/2 years, was the registered owner of a shoe business named Taco, based in Jaffe Road, Causeway Bay. Sentencing of To and Hung was adjourned until yesterday for Judge Hartmann to ascertain the reasons behind Yau's sentence. The court heard To and Hung exploited the standard practice by which retailers are given 60 days' credit by suppliers. They placed orders with shoe suppliers between July and October 1990, but when the time came for the post-dated cheques to be honoured, they closed the business overnight, moved the shoes to a secret location and fled Hong Kong. The whereabouts of the 7,500 pairs of shoes remains a mystery. Judge Hartmann said: ''There was no suggestion by the defence Taco was failing as a business and the defendants were in a panic as to what to do for the best . . . the offence did not arise out of the panic of merchants trying desperately to salvage something from their business. ''It was a planned, cold-blooded scheme.'' The judge said he was satisfied the two played a major, active role in the conspiracy and rejected the suggestion Yau was more culpable. He said he was giving To credit for his previous clear record and sentenced him to two years and nine months. Hung, who the court heard had two previous convictions, was jailed for three years.