Polo shows a volume of 1000+ btc on the day the 0.01 peak was hit. Mintpal data is unavailable but I bet that wasn't less than half the polo volume. So approx 1500btc worth of coins traded. Quite a lot actually
Not all those traded at 0.01, but close. Still, I'm surprised to learn it was that much. I never saw the 1000+ BTC volume numbers on Polo, I guess I just wasn't paying very close attention. Crazy times.