Please help with valuation

Hi I have a set of three gold coins from the Perth Mint. They are each part of the "Discover Australia" series and are the $50, $15, and $5 dolphin coins. They are graded by NGC but I can't seem to find their value on the website. When I enter the cert # on their 'collector's society' site it verifies the authenticity but says that numismedia does not have a value of these. Anyone know where I can find and track the fair market value of these coins?
Thanks!!
Thanks!!
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