Hi Peta,
@EmilyW has put together a nifty spreadsheet with ALL the Oceania people on this thread with their case numbers and where their case is at. You can find it here and in her signature block:
https://www.dropbox.com/sh/d6ykv9wrhiiz43z/AAD-60a_CXKBeC2UZnGewp1ga?dl=0. I'm sure she will add you to the list when she gets a chance.
I'm not actually sure, but I think the 2NL will go to the email you put on your original application, but perhaps someone else on here knows the actual answer. When you get the email, it will ask you to log back in to check your status (where you first checked if you were selected) and your selection letter is replaced with a 2NL which give you your interview time and date! You can also log into this at any time to check even if you don't get the email first for whatever reason.
With a case number like yours, it looks like it might be borderline as to whether you make it into selection this year. Keep an eye on the visa bulletin and fingers crossed for you!
P.S. I recommend reading this thread from the beginning (if you have time) as it's invaluable for all the information and experiences throughout the process from submitted the DS260 all the way through to people getting their green card.