I couldn't say I was ever required..cant even remember being asked to.
Took the lid off once because I was in a line, mid morning on a hot day waiting an RDT.
Other times I've been pulled up straight to the copper and just stuck it in over the chin bar...no fuss and not even asked for my licence. QLD ant NT
One time at the fruit fly station last year I was pulled to one side by a politeman and took my lid off out of habit as there was 5 coppers one a camera in hand taking pics of other two wheeled brethren ( I was solo).
Camera cop took one look at me /the bike and moved on. The other cop asked my destination and commented about cleaning me off the road because I was riding at night...big deal.
Required, possibly we are so the plan is a helmet with a scarf thing wrapped round it.
but depends a lot on attitude of Officer. I think your attitude and outfit has a bit to do with the big picture. Even when your a sure bet to be a few K's over and the HP goes by and just waggles his finger, lots of factores go through his brain before he pops a Uee in my experience no different regardless of circumstance.