By Ed Jackson and Alex Patrikios
Locked in a metal box, shot in the head, then dumped in a dam.
That's the terrifying scenario police fear missing Queensland friends Cory Breton and Iuliana Triscaru endured when they disappeared from the Logan area south of Brisbane on January 24.
A two-day search of waterways and bushland off the dead-end street of Mudgee Street in Kingston resulted in the grim discovery of a submerged toolbox in a dam at approximately 8am on Thursday (local time).
The discovery came just hours after six people -- five men and one woman -- were charged with the missing pair's murder.
Davy Malu Junior Taiao, 21, Stou Daniels, 21, Trent Michael Thrupp, 22, Webbstar Latu, 31, Tuhirangi-Thomas Tahiata, 24 and Ngatokoona Maretti, 36, briefly faced court on Thursday morning.
Three of the accused murderers, Latu, Taiao and Daniels were born in New Zealand.
The missing duo haven't been seen since they disappeared over a fortnight ago and police are yet to open the toolbox but believe it contains the remains of the man and woman.
"We do fear that the box will contain the bodies of the two missing persons," Detective Superintendent Dave Hutchinson said.
"[A murder scene] is yet to be determined but we believe it was probably -- probably -- in that Mudgree Road area."
A motive for the pair's alleged murder remains unclear, but Det Supt Hutchinson said it appears likely that drugs were involved.
The victims and all six suspects were part of a loose social group, police say.
Det Supt Hutchinson refused to speculate on the information that had led to Thursday's developments but did confirm Lelan Harrington, 23, who had initially been reported missing before being located on Tuesday, wasn't a suspect.
All six people charged with the crime appeared in Brisbane Magistrates Court on Thursday and have been remanded in custody.
Police are also keen to speak to two more men, a 32-year-old from Crestmead and a 25-year-old from Kingston, who they believe have knowledge of the alleged crime.
"If those people, and they will know who they are ... we would encourage them to come and see us now," he said.