That was a RIOT van, I didnt see any riot's personally but you never know
I almost always go down to chapel for dinner / coffee etc on the weekends, including last night. I dont actually grace the chapel st tarmac with my car - i just park "nearby" and watch all the clowns get defected - some ask for it, some dont. The only difference this weekend is that people were warned - Herald Sun, MX, The Age, NOVA, FOX and 7,9 & 10 news...
I also heard today on Nova that they got over 100 cars, between Prahran, St.Kilda and any other area they were 'targetting'. They defected 37 cars just on chapel friday night!
There is no yellow sticker on my car but i did witness a few get done.