NSW Police Commissioner Mal Lanyon confirmed Corrective Services stopped the family of the 24-year-old prisoner outside the super-max jail in Goulburn on Saturday.
"A search was conducted with the vehicle and found what has been described as a fruit knife and other pieces of writing," he told reporters on Wednesday.
Counter-terrorism police investigated the note and deemed it unrelated to terrorism matters.
The top cop would not divulge details of what the note contained.
The search occurred after Corrective Services contacted police. Mr Lanyon stressed police had not stopped the family's visit.Â
Akram faces 59 charges, including 15 counts of murder and one of committing a terrorist attack, after 15 people were shot dead on December 14 at a Hanukkah celebration.
His father died in a police shootout at the scene.
The Akrams are accused of carrying out Australia's worst mass shooting since 1996 by targeting the Jewish festival of lights at Bondi Beach.
After parking near a footbridge on Campbell Parade, the men allegedly tossed three pipe bombs filled with steel ball bearings and a tennis ball bomb into the Jewish celebration at Archer Park before opening fire.
But none of the pipe bombs detonated, despite preliminary police analysis finding they were viable.
A box-like bomb was found in the boot of the car while two hand-painted ISIS flags were also in the vehicle.
Fifteen innocent people were killed in the attack, including 10-year-old Matilda, Holocaust survivors and a retired police officer, and dozens more were injured.
Akram has not entered pleas to the charges and is not required to while the case is handled by the Local Court.
Corrective Services issued a statement confirming a weekend prison visit was denied.
"On Saturday, 21 February 2026, Corrective Services NSW staff conducted a search of a visitor car on the grounds of Goulburn Correctional Complex and discovered suspected contraband," it said.
Akram's lawyer has been contacted for comment.
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