The website digitalattackmap.com tracks events of this nature but as security pro Matthew Hackling posted last night, the site detected no unusual activity in Australia at all.
Hackling commented in a tweet: "Hmmm. Nothing unusual DDoS wise for Australia and yesterday #censusfail."
The North American Network Operators Group is normally aware of big DDoS attacks but there is no mention of any attack on their regular mailing list either.
Given the ABS' boast that the site could handle a million form submissions every hour, it would have taken an attack of some magnitude to bring operations to a halt.
Kalisch has been quoted as saying that the Australian Signals Directorate has been asked to track the source of the attack. He might as well start looking for an unicorn.
But right now, he may well need a bath and lie down, after first wiping off the copious amounts of egg on his face.