The problem with scandals involving so much mystery is they naturally lead to plenty of speculation, some of which might be useful and some which might be completely wrong, or even highly-damaging. And while we are still in the midst of it all, it's extremely difficult to sort out the useful from the damaging.

One theory is, rather than being hacked, the Treasury website might simply have been scanned by Google, allowing a cache of pages to become available to someone who has handed them on to the National Party.

Another leading explanation for how the Treasury's Budget information