On the evening prior to his death, Yin had secretly recorded conversations with people involved in various ship deals, and Wang later found the tape and handed it to investigating officials. The tape was subsequently demagnetized, strengthening suspicions that someone in the military was involved in Yin's death.
由於王萬瑩曾提供一捲由尹清楓錄下的反蒐證錄音帶，後來這捲錄音帶卻被消磁，更引起社會對軍方人員涉案的聯想。