i was thinking Bristile /Austral is all full time and to start they get them from integrated or they used to when i worked at the Malaga plant as an operator.
Try Caltex they always need staff and they use lots of Uni students etc .
Or if you go on Antilag forums in the off topic section they have a jobs board and quite often Carlton United are looking for warehouse staff on there as a member is in charge of job placement etc.