The investigation began after Australian Border Force (ABF) officers inspected 10 boxes of structural supports shipped from China, discovering a concealed white powdered substance.
Officers seized four handheld radios, along with other equipment allegedly used in the broadcasts, including two mobile phones containing recordings of the transmissions.
The crash killed 42-year-old mother Nancy Lefrançois and her 11-year-old son Loïc Chevalier, who were travelling in a passenger vehicle struck in the collision.
