I have also adjusted the rubbers on the bonnet and a bit of electrical tape on the bonnet catch. It has stopped it all together!!
Also I have been complaining to Nissan several times about a rattle, like metal pipes vibrating whilst I am driving on the highway. It doesn't happen all the time, but Nissan said to me that I am labouring the motor and that is why it is vibrating. I said at 2500 rpm at 120km/h it slightly vibrates, you put the accelerator flat to the floor and it vibrates louder and faster. If you put it back a gear it still does the same - and they still had NO answer.
Then another dealer said to me, its the clutch hose that is rubbing on the firewall. They have repositioned it and it has now stopped.
But I still have a light rattle on the higway in that floor area of the firewall / pedal area. When I was going away the other day it was starting to do it again, and I lightly touched the clutch pedal - while I was driving - and the noise went away. It is the spring in the clutch that is the annoying rattle. Damn Nissan mechanics, can't find anything can they? Its been annoying me for 40,000km!!!