Sublime

Jerusalem;

These are the sons of Israel: Reuben, Simeon, Levi, Judah, Issachar, Zebulun, 2Dan, Joseph, Benjamin, Naphtali, Gad, and Asher. 3The sons of Judah: Er, Onan, and Shelah; these three the Canaanite woman Bath-shua bore to him. Now Er, Judah’s firstborn, was wicked in the sight of the LORD, and he put him to death.

8Whoever had precious stones gave them to the treasury of the house of the LORD, into the care of Jehiel the Gershonite. 9Then the people rejoiced because these had given willingly, for with single mind they had…

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As stated there (ibid.:11), the obligation to return the article or the money applies only when both parties are Jewish. Although it is forbidden to deceive a gentile regarding the value of merchandise, it is not forbidden to take advantage of an error the gentile makes on his own.