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There probably is no FOIA guide there or in many parts of government. It isn't a big enough priority to spend time coming up with a process.

Their response implies indicates that it does exist:

"This request is denied because the records you requested were prepared by an NYPD attorney..."

The NYPD gets thousands of requests. NYC get, on these figures, at least 40,000 a year. Known requests to the NYPD in a shortened period were ~1900.