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An artwork described by Constable Dean Schroder as "very recognisable" was stolen from a Lakeview Tce property in the McNulty Inlet area about a month ago.
The painted old hopper had been sitting upside down in a paddock for several years, and was believed to weigh about a tonne, so would have needed a tractor or hiab to shift, he said.
"From its appearance, it would be easily recognisable if it was seen on anyone else's property or at a scrap yard."
Police also want to hear from anyone with information about an ornately-decorated steel sword, which was discovered by a couple who stopped at the Champagne Gully rest area in the Cromwell Gorge on June 21.
The 1.5m-long sword was reasonably heavy and was found leaning against a rubbish bin at the rest area, Const Schroder said. Police had not received any reports of a sword being lost.