This TB/GC is no longer in Helsinki City Museum cache and hasn't been there for a couple of days. Hopefully the geocacher who's retrieved it will submit the proper log soon.
In case the geocacher won't do it in ten days or so we need to mark the item as missing in order to keep the geocache's inventory correct.
Most likely the TB/GC is, though, safe and sound in the hands of a geocacher who hasn't yet been able to submit the proper online log.