Common problem unfortunately with the Z. Common culprits are the rear latch for the trunk, loose body panel, or sometimes there is a missing rubber grommet. If you open your trunk and look at the sides there are two clear quarter size grommets. In some cases one was missing causing the hatch to not close fully. You can adjust the latch (although kind of a pain to do) to make the trunk close more snug. Lastly, check all the body panels for loose or broken fittings.
Honestly, my 2010 Nismo has a bit of a rattle and has since near the time I bought it. Only happens in the winter when it's cold. In the summer when things expand a bit it's not there. Same with a shifter rattle. Considering it's only cold here 3 months out of the year I just deal with it.
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