Will a stolen car be covered by insurance if the key was not in the ignition?

I live in IL. We were on our way to Memphis but stopped on the way to visit family. We were about to cross a bridge but noticed gas was low so we decided to stop and fuel up. We were in a seedy area and I pumped the gas while my boyfriend went it to get drinks. I needed to use the restroom but noticed the windows were down and didn't see a key in it. I caught up with him to get the key and as soon as I asked him for it, the car was driven off. Can they deny the claim?