I visited this cache recently and unfortunately I'm letting you know this coin is not in the cache.
You can remove it from being listed in the cache and place it into an unknown location. This will keep people from making a trip to the cache for a coin that isn't there.
On the coin page, under Trackable Item Options is the option "Mark item Missing". Click Go.
You can always retrieve it back out at a later time if it is found or re-released. Thank you.