A LANCE-CORPORAL of the Royal Hong Kong (Volunteer's) Regiment who stole four credit cards from fellow volunteers and used them to buy video equipment and shoes was convicted in the District Court yesterday. Unemployed Liu Yum-bong, 33, was found guilty of four counts of theft and three charges of obtaining property by deception. Liu was cleared of one count of theft and five of obtaining property by deception. Last week, Deputy Judge Christie ruled that Liu had no case to answer on two counts of obtaining services by deception. Liu, who was represented by Simon Lam, had denied all charges. The judge called for a background report and remanded Liu in custody until sentencing on June 2. Prosecutor Jeffrey Fenton told the court that Liu used three of the four stolen credit cards and bought a video recorder, a cigarette lighter and a pair of leather shoes. The goods purchased were worth more than $10,000, the court heard. Liu also stole a total of $1,676 from the four victims. The court heard that Poon Man-yau, who was deployed on border anti-illegal immigrant duty on November 14, 1992, went for a shower and left his wallet outside the shower stalls in the camp. Later that evening Mr Poon discovered that $500 cash and a credit card were missing. The other victims, also members of the regiment, were Chan Leung-shuen, Wong Kam-man and Choi Kwok-wah. Their cards were discovered stolen between November 1992 and January 1993, and Liu was arrested when he returned for duty on February 9, 1993.