The Experts Cannot tell?

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From a UK coiney magazine

"When examined by the experts at the British Museum and the Fitzwilliam Museum, the coins were deemed to have been struck using forged dies or been cast in a mould". 

Quite a difference one would have thought in technique, but these fakes were so good, the "experts" cannot tell? Among them are the same guys that proclaimed a Proculus coin, coming up for sale soon, a "fake".