The cards were allegedly distributed to children at the Cisarua Refugee Learning Centre by people who reportedly trespassed onto school grounds.
"This has been a long and tough campaign against a powerful adversary."
"I have seen just how essential and empowered ICAC is to go into the nooks and crannies of the way government deals with corporate Australia."
The federal ICAC bill was set to be introduced next week.
The ball made headlines last month after it was revealed to be sponsored by major fossil fuel companies and lobby groups.