I received mine today. In the package is an HTML page that lets you see your Miiverse posts page as the original Miiverse interface. If you don't see it, check other folders such as promotions (that's where mine was), spam, bin, etc. If you still don't see it, fear not, it seems everyone didn't get them at once.
A few directories of interest:
Handwritten posts: assets/user/img/pa
Your mii expressions: assets/user/img/mii
You have until December 31st 2017 to download the package.
Just a quick notice to say that the forums will be permanently closed for new registrations from 9th May. This will take place in the morning where I am in the UK which is ahead of US members so you'd do well to consider the 8th as your deadline.
I have moved off vBulletin 5 to vBulletin 4 for more stability and some more features. If you were already registered on our secret board simply login to that account. If not you will need to register on the new software.
If you cannot login it's probably because you never got to logout of the old software and there is a cookie clash. Clear your cookies and you should be good to go!
All data from vB5 is gone as you cannot downgrade the software, but I made a note of all postcounts above 100 so I can restore postcounts higher than 100.
Now we have an arcade of Flash games for you to enjoy!