Hobbs is a funny place, sometimes they remember to take the keys out but other times they didn't - for example, couple of weeks back a mate and I rocked up there to pick up his Ceffo but a R32 GTR blocked us. We saw the keys, started the car and moved it but no one questioned what we were doing...also their battery pack is highly visible so any opportunistic low lives could've been there, waiting for the right time, jump start it and drive it under their nose.
There's another place that could do this - ANJ (or is it ANK?) in Sydneham, right behind the station. Last time I've got one cleaned/vaccumed for $180 which is some $30 cheaper than Hobbs BUT it must be towed there, it is a fair hike to drive and by AQIS rules you aren't suppose to drive it anyway even to Hobbs. Cost me $60 to be towed from AAT to there and everyone's happy.