I've just noticed that the Mark As Missing option on a TB/GC page now sends an automated note to your geocoin's page. I wrote a note too, to explain it's loss.
This is the automated message now on the GC page:
[This is an automated message]
This is a message to let you know that your trackable item TB22ND4 has been marked ‘missing’ by a cache owner or a site administrator. Trackable items are marked missing when it is determined that they are no longer located in the cache they are listed in or in the hands of the current holder. Please review the most recent logs on your trackable item to learn more information about its current state.
It's not needed. I'm reporting it missing!