Yeah a red Grumman AgCat.
One of the local Aero Club members rather enthusiastically rang the "alert but not alarmed" Hotline and informed them of the performace and payload of an AgCat, telling them it would be perfect for carrying a Berm.
Lifted from Dirranbandi, just south of St George QLD.
More likely just plain stolen than anything more sinister I would have thought...