Gold bars that have been stamped with counterfeit refinery logos have made it into the global market — even getting into JPMorgan Chase’s vaults, according to a new report.

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The sophisticated fakes, unlike many counterfeits, are made of actual gold, but have been illegally mined or processed, Reuters reported. The fact that the bars are made of gold — instead of simply being gold-plated — makes them much more difficult to identify and stop.

“The level of counterfeit is becoming really good,” an anonymous Swiss refinery executive told Reuters. “Even for us it is hard to tell. They are, however, slightly less pure because the people doing the counterfeits don’t have the equipment we have.”

Though the source of the fakes is unknown, experts told Reuters the bars could come from China and enter the market through Hong Kong, Thailand and Japan.

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