Lost my only key, what are my options?

[SVO LOU]

Guys,
I have this 03 XC70 that I bought early last year and drove home, a fairly nice high-mileage car, but it needed a radiator because the upper plastic filler neck had several cracks. No big deal, park it in the back, order a radiator, and replace with my son as his first car when he's ready.
Fast forward to this week and my son and I replaced the radiator and the car is ready to run but I lost my one and only key to it...Can't find it anywhere although I do have a working key fob to it but that's it.
Can anyone tell me what my options are?
On a side note, I have an 03 xc70 parts car that I've stolen many items from my other kids' cars and it does have a key...It is as simple as swapping the ignition switch and door lock and we're on our way? I also have a Vida/Dice but I'm definitely no expert with it.
Thanks for any help.

[volvolugnut]

Try going to the dealer with VIN and your state proof of ownership. They may be able to provide a new key. It may not be cheap.
If your ignition lock was ever replaced, this may not work. Every key will have a code chip matched to the car electronics and swap will not work unless other steps are taken. The dealer should match new key chip to your car using VIN.
volvolugnut

[jonesg]

" I do have a working key fob to it but that's it."

thats the most important thing, the fob contains the coded chip , see if the dealer will cut a new blade, I was quoted $100.
Or you can just swap the lock barrel and blade from the parts car.

[kallekula]

All you need is the vin and proof of car ownership.

[abscate]

Swapping the lock barrel involves cutting Dremel slots into security screws. See thread in my Catherine maintenance thread , link below