He did tell me 2 dogs have been sighted on the other side of the forest, its possible they are feral or belong to an adjacent farm.
So I'm going to chuck the scat out and write it off as a feral dog attack.
One More Picture of Scat(Feral Dog?):

Termite Mounds(bored kids?):


These two mounds are located within 20m's of each other and also the photo's of the last two saplings
Tree damage (I think its natural, I haven't seen any footprints or other to suggest it isn't)
Found next to a creek, there would of been maybe another 3 like it.

These are near the termite mounds:


Wasp Nest found within 2m's of scat:

Conclusion: It could be possible for a hairy fella to get to this forest by bush corridors which run along the toll roads, however there hasn't been any recorded sightings of Yowies, nor any other cryptids to my knowledge.
The area is used by Bush walkers and Mountain bikers daily, and nearly all trails I have been down show some kind of activity from humans, be it a cigarette butt, beer bottle or syringe (I've found burnt cars, stereos, lawn mowers!)
The forest shares 3 borders with 2 suburbs therefore I can't rule out domestic animals contributing to wildlife kills, which I have found on trails.
The last resort is to stalk the place out at night, but I don't think I'm going to waste my time; especially if people are going in there to get high on drugs and vandalise the area.
If there is a Yowie in that forest it has learnt to be extremely stealth when crossing trails and choosing a place to rest during day.