I collected my items everyday and didn't get it. I wonder if it has something to do with actually watching the animations all the way through before clicking collect prize, because I know a few days I didn't even bother to watch, I just pressed the button.
I claimed the advent callendar prizes everyday without watching any animations.... & didn't get it as well I wonder if, one can get the winter sidebar only with a relatively small probability checking each time you claim the prize?