The inquiry panel will submit its report to the King in September after hearing from 48 witnesses over 17 days.
Investigating officer Woon Tan Seng says the low-ranking policemen were arrested for escorting illegal immigrants and released.
Home Minister Muhyiddin Yassin says he will brief the RCI members on their tasks next week.
Authorities are not sure if the victims were local residents, where several disappearances had been recorded in recent months, or if their bodies had been relocated from elsewhere.
South Korean soldiers were handing over lacquered wooden caskets covered with red Chinese flags to Chinese honour guards at Incheon airport where they were loaded onto a Chinese air force cargo plane.
Ninety previously-unidentified Argentine soldiers who died in the Falklands War have now had their identities ascertained.
The deputy IGP says the investigation into the case is still ongoing and that the police are now in the process of prosecuting several suspects.
Offences took place at Bukit Genting Perah, Wang Kelian, at border with Thailand between October 2014 and May last year.