After claiming for years that they couldn’t find any documents about what City Hall knew about the dangers of the 9/11 toxins swirling around Ground Zero, the city Department of Environmental Protection has now discovered 68 boxes worth of information that could be pivotal in learning more about what first responders and survivors were exposed to, the Daily News has learned.

The materials, ironically, included a directive from the city Law Department written two decades ago ordering the agency to save and preserve any information about the terror attacks and its aftermath that could be used in future litigation, said Andrew Carboy, an attorney representing 911 Health Watch, a responder and survivor advocacy group.

“We’re witnessing pure alchemy, creating documents from absolutely noth

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