The Oxford police were investigating three separate cases in 1966 which DC Endeavour Morse sensed all tied together. One of these was a break-in and robbery of items from the second Wolvercote trove at Balfour College. There was mention of a belt buckle from that same era which was being held in another collection.
That belt buckle figured in a different murder mystery that preceded this episode - in the real world. But on the Toobworld timeline, it would happen afterwards. In "The Wolvercote Tongue", an episode of 'Morse' set in the 1990s, the Wolvercote Tongue was the driving cause behind several murders.