There are two groups of caches in the series that can be accessed from the Parking Waypoint:
1. GC4FX18, GC4FX4Z, GC4FX6N
NB: It is best to return to the track after each cache.
2. GC4FX6A, GC4FMVT
NB: There is a bit of a hike for these 2 ... and potentially a creek crossing.
It is best to return almost to the Parking Waypoint after doing the first group rather than attempting to go directly between GC4FX6N and GC4FMVT.
There are also some other accessible caches in this area.
The Gnome Hunters
This series pays tribute to cachers who have completed the Serpentine Gnomes series and celebrates some of the great logs written by said Gnome Hunters.
ManJas6981
ManJas6981 on Serpentine Gnomes 3: "What a great cache to finish a great series. Made all the slogging through the bush worthwhile. Thanks for an awesome series.".
Glad you enjoyed the series and the final. I'm sure you enjoyed the slog through the bush as well. 
The Cache
Not much of a slog to get to this one. There are signs of economic activity here from a previous era around this hide.
It's a bison tube