NWP just phoned me. They have taken more details from me. In my email to them I mentioned several items have gone missing. I said they were aware of one theft from Blaenau from August 2010. They wanted more details of this too. I was able to bring Wrysgan into the conversation too.
I made it clear that, to my mind at least, whilst the two thefts from Blaenau could be linked (both took some organising and manpower) I doubted they linked to the Dinorwic items on eBay.