I don't know the spare keys look exactly like the other keys. They have that chip thing in them to or w/e its called the only real difference between the 2 keys is the keys i gave them has the key fob on them. I was thinking the same thing, but who knows. If they call me when they try to do the break line telling me it doesn't start then I guess we'll see if its the keys or not. They only other thing i can think of is yesterday it was raining like crazy pretty much all day and lately its been warm enough to melt the snow so there has been a lot of moisture in the air maybe it has to do with that?
Here is a pic of my spare keys and like i said the other keys look exactly like those just black.