There was a story that Keith himself may have made these as he was handy at a lot of things. I favour the idea that they were made by a local Ballarat potter who traded under the name "Old Ballarat Pottery".
The property has been for sale for the past few years, with one sale falling through. Several buyers were reported to be interested, some more outrageous than others. A new buyer, (January 2012) "Castle Tourism and Entertainment have now completed a multi million dollar redevelopment that has turned it into a world-class medieval adventure park. This consortium consists of several local Ballarat business people and a British / Singaporean company. The castle re-opened on the 2nd of March 2013 and will be one of Victoria's top tourist attractions. Go up there and spend a full day, or stay overnight as I did recently.