I wonder if thats something to do with their cages. I go to the CP depot often (which is effing huge) and i can see their cages, which look too small for golf club boxes, so maybe they have to be manually outsorted and get held. I will find out.
I ship lots GC to Sydney with CP, always delivered next day, Melbourne is 2 days.
BTW, shipping by road to/from WA at the moment is chaos, so expect delays.