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Well there not standard keys, had the car been stolen recovered in the past?
Reason I ask, as if both keys are different, looks like last owner has had to replace the locks. And used to different locks. And those keys don't look like they have any chips in them too start the car.
Looks like the security system has been removed. So after market would be the way forward.
The Subaru keys like most have a chip in them to speak to the immobiliser, which lets you start the car. Yours keys just look like standard spare keys, with no chip in them.
I think its been broken into, and door lock and ignition lock have been damaged, and the locks have been replaced, as both locks should use the same key.
Also as the keys don't have chips in them and the sigma alarm looks to be not in use, i think they have bypassed the immobiliser somehow. Best way to check is get the ignition key copied, with just a standard spare key, and if it works with starting the car, then you 100% know, there is no security on the car, so I'd opt for a full new security system which will also give you remote central locking aswell.