Okay first off, every single set of handcuffs I had ever bought (including the fur lined ones) always had TWO sets of keys. Including the made in China ones. They come in pairs for a reason so if you lose one, you have the other.
Secondly, the ones you buy at the bookstores are not even real locks. They more like a pressure plate holding down the cuff arms. A paper clip could of opened these cheap cuffs. No I didn't break the key. I lost the key an the spare was in my car (like it's supposed to be!)
Lastly: do NOT put handcuff keys with your house/car key ring and enter a correctional facility. These people will get into your face and give you the third degree on WHY you have them because they think you are trying to free a prisoner or some crap.