You can use lead on them so long as you are targeting upland game (quail are not waterfowl). So don't have your duck caller or decoys on you.
From http://www.fishandgame.org.nz/sites/...202016%20C.pdf
"USE OF LEAD SHOT AMMUNITION OVER WATER
(S18 Wildlife Act 1953)
It is an offence to possess, or hunt waterfowl with 200 metres
of open water using lead shot ammunition otherwise than with
the exceptions allowed (see use of non-toxic shot above). The
maximum penalty is $5,000 fine, and forfeiture of shotgun used"
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