Confused about Canning passes

I used Google and read the Exploroz trek notes. Over the last few years I have had conflicting reports. Yes -- you need two. Yes -- you only need to get one and finally No -- you do not need any. No dates or disclaimers on any of the stuff I found. But lets move on. Maybe it is just my fiddly finger on the keyboard.

I even put "Canning" into the text search in this fourm. Cop this NO RESPONSES. Now that must be wrong.

Firstly:
What is the latest and if a pass or more is required, where do I go to get a pass for July this year.

Secondly:
What was wrong with my "Canning" search to not get ANY responses?

Phil