This TB wasn't where it is logged as being.
Sleepy Steve has solved the mystery - the container for the TB in the Gallery is surely the one actually in Missing Link Three - Kidderminster view. So the TB was logged in the wrong cache. It seems that Missing Link 3 may be truly missing but will await developments - being by the main road it may have rolled away and been swept up. Shame, we looked for it to taking the TB to New Orleans!