I am very sorry that I must confirm that your coin has been robbed out of my cache Topmolen. Today I checked the cache and I found 2 plastic geocoin-holders that were empty😟. I retrieved them out of the cache and added a note to the cache listing for future cachers not to leave coins here anymore.
I advise you as owner to move the coin to a TB graveyard (e.g. GCJPM7). This way it doesn't disturb cachers, and if by any chance your coin reappears it can restart an active life cycle.