His red Toyota Celica was last spotted in Tweed Heads at a carpark on Coral Street.
Witnesses who saw the car also told police they had seen a flash of light and heard gunfire at the time his car was last seen.
Mr Rosson, 67-years-old, was shot and killed only days later on March 14, 2002, after meeting with two men at his Mount Nathan home to purchase a gun he has advertised.
A red Toyota Celica was also spotted at the address and was later found abandoned in Pam Beach a week later.
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