Mindbender: Securely locked

You want to send a valuable object to a friend. You have a box which is more than large enough to contain the object. You have several locks with keys. The box has a locking ring which is more than large enough to have a lock attached. But your friend does not have the key to any lock that you have.

Note that you cannot send a key in an unlocked box, since it might be copied. How do you do it?

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