Clark Rockefeller bought $300,000 in gold coins that can be used anywhere in the world weeks before he allegedly kidnapped his seven-year-old daughter and left the country, the owner of a precious metals shop told ABCNews.com.

Rockefeller mother on air/The Boston Police Department has an arrest warrant for Clark Rockefeller...

Rockefeller mother on air/The Boston Police Department has an arrest warrant for Clark Rockefeller on custodial kidnapping, assault and battery and assault and battery with a dangerous weapon charges tied to the abduction of his 7-year-old daughter, Reigh.

(ABC/Boston Police Department )

Ken Murphy, 42, the owner of Boston Bouillon, said Rockefeller bought 300 American Eagle gold coins last month. The coins are worth $1000 each, Murphy said.

He said Rockefeller, who went by the name Clark Rock when he came into the office, one of many aliases Rockefeller has allegedly used, said he had recently won a patent lawsuit and was investing the proceeds in gold.

"You can use them anywhere," Murphy said of the gold coins. "They can be convertible into cash anywhere."

Murphy said Rockefeller carried the gold coins, which weighed almost 19 pounds, out of the store in a briefcase. Murphy said ther money was wired to him from a bank account under the name Clark Rock.

Earlier this week a Boston police official with knowledge of the case said Rockefeller told one acquaintance that he used "$300,000 in gold bars" to buy a boat. Police believe Rockefeller may have fled the country on a recently-bought yacht named "Serenity."

Acting on a tip from a police source, ABC News located Murphy on Friday.

The revelation about the gold coins comes as police on the island of Turks and Caicos said Rockefeller and his daughter, Reigh, were spotted buying supplies on the island. Police say Rockefeller abducted the girl during a supervised visit in Boston on Sunday.

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