If you get the new locks through the dealer, give them the VIN number of the vehicle. They will get you locks with the exact same key, no problem. Additionally, if you have any brass keys left, replace them with steel keys when you get the new locks. It has been found that the brass keys will deposit particles over time, ruining the lock cylinders. The particular cylinder that you really don't want to fail is the ignition lock, get steel keys while you're going through this problem. So, you won't have different keys to keep up with.
It's terrible to see something like this happen, there are some sleazy people in the world we live in. It's pathetic.
Best of luck with this,