Just as "caneman88" said there is a receptacle for the filter but no filter. Also just as an FYI, part #27277-AR225 Charcoal Filter for the G will not fit in the Z
The one in the G is huge compared to the Z as I figured. Sorry but no DIY as I did not have the time, first day of school for the kiddo tomorrow. But, it is identical to the G:
In Cabin Micro Filter Replacement Procedure Infiniti G35 / G37 Sedan