As Frank Broughton is neither the coin owner nor have visited this cache ever, it sounds as if they have lost the coin. Reding the logs verifies this.
Lost coin should be marked as missing, not dropped into random caches.
Coin owners, cache owners and admins can move trackables to 'unknown location'.
As coin owner, please mark this coin as missing, and let's hope that someone somewhere finds it grabs it and the coin continues to circulate. But until then the location of the coin should not be in the inventory of this cache. Thank you.