Keg has been on the -400 for too long already!!
QF7623 is a B767 freight service SYD-AKL. QF7624 is AKL-CHC-SYD or AKL-SYD (Arr 0605). There are also B767 MEL-AKL and AKL-MEL freighters.
6000 flight numbers are positioning, training, charter, or demo flights. 7000 numbers are freight services.