We've all done it before: lost our keys or misplaced a single key that we later discovered missing. Most of the time, it's not the end of the world and obtaining a new key is as easy as making a copy of a master key. However, sometimes losing a key carries with it more repercussions than just the cost of making a new one. It can weigh on your conscious if you’ve misplaced a house key or the key to a shed--after all, what's stopping someone from finding that key near your home and…