A man claiming to be the son of former Philippine president Ferdinand Marcos has been found guilty of using false documents in an attempt to withdraw US$90 billion (HK$702 billion) from a 'secret' HSBC account that did not exist. Deputy Judge Julia Livesey said the prosecution had proved beyond reasonable doubt that Tiburcio Villamor Tan Marcos, 53, had used the documents, which he knew to be false. Marcos denied one count of using a copy of a false instrument, one of copying a false instrument and one of breaching his conditions of stay yesterday. The deputy judge convicted him of all charges at the District Court. Deputy Judge Livesey said the accused was 'totally unreliable and dishonest', but she did not make a finding on his claim to be a son of the late dictator. 'All I need to find is whether the documents in question are genuine or false,' she said. Marcos, defending himself, had told the court that all documents involved were genuine and had been given to him by his father. Although several HSBC employees testified the documents presented by him through two agents were false, Marcos had claimed that the account was 'top secret' and the witnesses were 'not senior enough' to understand. The deputy judge accepted evidence by Mark Sullivan, senior security manager of HSBC, that the bank did not hold any secret account and that the documents submitted by Marcos were in fact bogus. The court heard that Marcos had instructed two men - Karsten Kenntoff and Georg Lipp - to arrange a meeting with the HSBC chairman in March last year in order to seek the withdrawal from a 'secret account'. Documents including an insurance certificate for US$54 billion and a custodial safekeeping receipt for US$36 billion had been faxed to HSBC to facilitate the request, but bank staff said the documents were bogus, the court was told. Marcos arrived in Hong Kong on February 19 last year and was allowed to stay until March 19. He was arrested in a room at the Guangdong Hotel in Tsim Sha Tsui on March 31. Marcos denied the charge of breaching his conditions of stay and told the court he was not aware of the time limit on his visa. Deputy Judge Livesey said she would call for a psychiatric report on Marcos before sentencing him on March 7.