One of the eight teens charged over the deaths of Chol Achiek, 12, and Dau Akueng, 15, allegedly had the sword on September 7 - the day after the boys were killed in Melbourne's outer northwest.
Detectives seized the blade from the 16-year-old accused's house on September 19, Melbourne Magistrates Court was told.
Photos released by the court on Wednesday show the weapon lying on the floor of a shed, wedged between a blue hand trolley with an old washing machine and tools nearby.
The accused boy's father previously told the court he confiscated the sword off the teen on September 7 without asking his son why he had the weapon.
The man, who cannot be identified, gave evidence that he placed the sword in his shed.
He denied moving the weapon after that date but said he could not recall if he placed it in the position depicted in the photograph.
Preliminary testing suggested it was likely the 16-year-old accused's DNA was on the sword's handle, while the DNA of one of the slain boys was on the blade, the court was told.
Another one of the underage accused called his cousin five times on the night of the alleged murders, the court was told.
The 19-year-old cousin, who also cannot be identified, denied speaking to the boy but records showed the series of calls, including one that went for more than a minute at 8.59pm.
The cousin told the court he had been at church "praying to God" at the time, although he could not confirm the religion of the church he attended.
The man also denied having access to a phone in September 2025 but later confirmed it was his number found on the call records.
The 19-year-old told the court he was a member of a gang that involved his cousin and Kon Hsu Sein, an 18-year-old man who was allegedly murdered in December 2024.
But the man denied knowing any other members of the gang, nor its social media group chat named "The Clubhouse".
He later conceded it was his Instagram handle found in the group chat messages but maintained he did not know the other people in it.
The case will return to court in May where further evidence might be called before a committal mention hearing for the three adult accused - Abel Sorzor, Prince Conteh and Peter Addo.
The five other accused, all aged 15 and 16, will face a children's court at a later date.
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