What must be proven for the crown to retain a found item under the Treasure Act 1996?

Under the Treasure Act 1996, the Crown must demonstrate that the found item is of national interest and qualifies as treasure for it to be retained. The definition of "treasure" includes certain types of metal objects that are over 300 years old, as well as coins and certain archaeological finds, reflecting the significant cultural and historical value attached to them. By establishing that the item is of national interest and meets the established criteria for treasure, the Crown secures the right to claim ownership of the item, thus promoting the preservation of the nation's heritage.

Other considerations such as the cost of maintenance, financial value, and aesthetic appeal, while they may influence the value seen in the object or the decision-making of collectors and institutions, are not the legal criteria set forth by the Treasure Act. The focus is strictly on the national significance and the categorization as treasure outlined in the law.