Of course he didn't do it every time because verification for that time frame had been established.
But …
He did it everytime he had to make a TC pwd change, there was an issue with the board, he needed to make a new private board, and when 8kun finally came up.
A 1.5+ year absence certainly qualifies as another occasion where it needs to be done.
And Q's attitude towards verification spread throughout the drop history indicate clearly that Q would agree.