To get a new key you just need to supply the VIN to a Subaru dealership. They can get it cut from that. Also, if you buy a new key and get it coded, the other, stolen keys wont start the car, or unlock it with central locking. But they will still fit the barrel and door locks. I would suggest buying a new lock set from Subaru, includes ignition barrel and lock, door lock, and boot lock, plus 2 keys. Probably $1500.00 plus fitting and coding, but the best way to make sure those lowlifes cant get into your car.

This changes all keys and locks to a different cut

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F.B. Racing
01 WRX (STI badged)
2010 XR5 Focus
06 Impreza Hatch 2.0i