Stolen Axes Returned, no Arrests

A thief or thieves stole two Stone Age axes from the Yorkshire Museum about a year ago (BBC, 'Stone Age axes stolen from Yorkshire Museum', BBC News, 22 March 2012)

The axes, each 5.9in (15cm) long, were stolen during a public "handling" display at the museum in York. [...] Lee Clark, from the York Museums Trust, said: "The axes were part of the handling collection at the museum, but they were securely fastened to the display. "The axes, although not of great financial value, were important to the trust's collections and we would like to appeal to the thief to bring them back so they can be once again enjoyed by the public." Mr Clark said the trust believed the items were stolen during a public event at the museum on 7 March. He added: "York Museums Trust strongly believes in allowing visitors to get their hands on history. However, following this theft, the trust will do a full review of its handling policy security to make sure such incidents do not happen again." 

Indeed. The objects however turned-up again ('Stolen stone-age axes are back at Yorkshire museum' York Press, 29th June 2012).

A dealer came forward after being sold the items, which had been stolen from the Yorkshire Museum in March. Police are continuing their investigations to try to trace the thief or thieves. The prehistoric artefacts, each about 15cm long, were part of the handling collection in the museum when they were taken in what police called an “opportunist” theft. 

Is it not rather odd that the dealer did not get the name and details of the person selling these items?What kind of 'due diligence' is that? What do we know about this theft one year on?