I suspect you may have two species of Calvatia here. The last image may be one of the purple spored species (Calvatia cyathiformis) whereas image 4 is brown spored.
Okay. They were all together but spaced apart. Happy to make two sightings... what about the first three photos? I do have a few more photos as well. I knew I should have taken samples in to Heino. ;)
Our knowledge of this genus in Australia seems relatively poor. Species Fungorum recognises 64 valid species worldwide with 10 described since 2000. For your first four images, I don't think we can take them any further than the genus Calvatia as the fruit bodies are either immature or one needs to use microscopic features - not possible with standard CNM images. For the purple one, if you have images that show it from side on these could be useful if it shows the nature of the base - see particularly sightings 4234160 and 3397778
Thanks for all the info. I don't have side on photos for the purple one. I will go back and see if any others are still there with fruit bodies plus re-do the sighting into two. I think photos 1 & 5 are a pair and photos 2-3 go together.