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As opposed to 600 finds reported by 60,000,000 members of the public (nigelswifts figures)

How many finds are unreported using these figures?

Your reasoning is sound, it's the math that I find iffy.. :-)

60,000,000 people aren't roaming the countryside with equipment designed to find buried metal. If you provide figures for members of the public actively looking for artifacts then I would be happy to do the maths for you.