Are you saying that what Fedex has posted on their website is a lie?
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Fedex is not lying. Fedex is mistaken.
There is "zákon 235/2004 Sb. § 92" which defines investment gold and frees the investment gold from value added tax when sold in Czech republic, from EU to Czech republic and when iimporting from other states. There are no restrictions.
Such conditions should be equal in whole European Union, as far as I know.