Organised Crime Squad Detective Senior Constable Paul Giuffre said the vehicle owner had stored the bobcat at another person's property on Gibbs Road, Nowergup, in November, 2013.
"Sometime between November, 2013, and February, 2014, the bobcat was sold to a third person who lives in Quinns Rocks," he said.
"Police inquiries revealed that this person has then sold the bobcat online to an unknown person. Despite extensive inquiries by police, the bobcat has not been located."
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READ NOWThe 1996 yellow CASE bobcat's registration number was 1AOE 972.
Anyone with information can call Crime Stoppers on 1800 333 000, quoting reference number 7811.