With my 2011 G37xS I was able to disable the lock/unlock fob beeps by using the fob (Press and hold the lock and unlock buttons on the fob until the car beeps) That silenced the beeps for the fob and the door and fob buttons, but not the trunk button. Every time I press the trunk button it beeps four times, always.
I found the beeper and unplugged it. It is beside the driver side air filter. Connector E57.