Police in Chandler, Ariz., say three men were arrested in a credit card scam after a Wal-Mart employee mistakenly sold them an empty computer box.

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Wal-Mart officials called police after the men returned to the store claiming the computer box was empty when the opened it, The Arizona Republic reported Tuesday.

When the officers arrived, the three men fled while allegedly throwing a stack of 19 credit cards to the ground, said Detective David Ramer.

The cards were counterfeit -- made to look like cards issued by banks in Mexico and imprinted with valid U.S. account numbers, Ramer told the Republic, noting a Wal-Mart worker did inadvertently give the men an empty computer box when they made their purchase.

The men, Mexican nationals who entered the country legally, were charged with three counts of forgery and one count of fraud.