Nissan: Need help...problem with 350-Z keys

I lost the main set of keys (w/keyless entry remote) to my 350-Z Track.
Left them lay in the local post office and went back 30 minutes
later.....gone...someone walked off with them. The only other set of keys
to the car (brown key and other keyless entry remote) are locked up inside
the car in the console.

Does anyone know the best way to get inside the car without tearing up or
screwing up the car? I imagine that the engine will be immobilized when
access is gained? Who should I have help me? Locksmith?
Dealer?

Thanks...

nelson family wrote: 

Actually, I believe he can see the dealer and he can make a key by
simlpy having proof of ownership. I don't know if they would need to
order it, but I'm pretty sure they can help you out. Might cost alot of
money, but it's always better than having the hatch removed.