@Tree frog Search for Aus people who have bought recently (past 3 months) and talk. If I find any, I'll PM you. Long post, sorry!
From what I've read, it seems as if Aus customs & police are stricter than most countries re N. I have read more news stories of custom failure and of immediate and delayed follow-up by police coming from Aus than elsewhere. However this might be limited to a past crackdown on Exit members. It's also possible Aus media has greater willingness to report on N crackdowns, in order to deter; I know the UK takes the opposite approach. So, is Aus actually riskier?
Either most raid stories concern Exit members because they are indeed targeted more often due to optics/poor security OR Exit member stories are more likely to be reported in the news and shared on forums, giving that impression. I can't determine the "wider community" risk, like us. Most people buying N are not SS members either, so how do we know what's really going on?
We have to remember most countries have different approaches re sharing info. (Example: UK likes to keep quiet about operations. No FOI requests will supply info. 'A' says most packages go through UK customs fine, but that's only the first step. UK police are aware of SN and are following up domestic and foreign purchases of (legal) SN, years later. We only know this because so many people on this site buy SN, due to the cost of N, and share their stories here, otherwise we'd be in the dark.)
Anecdotal (dubious?) info on this site: 1-3 years back: Aus, NZ, US, French and Canadian SS members claiming to have been raided/"welfare checked", fined or placed in psych wards, even several months after purchase of N. I haven't heard anything since.
Fortunately, prison time is extremely unlikely. Personally, my fear is not prosecution, but psych wards and my family.