Are you saying that the customer bought a fifth unit, and it arrived without a cable? If this is true, then he is entitled to a refund. Most states have what they call a "Fitness of Merchantability" law, also known as "implied fitness for use." He should talk to his lawyer, unless he bought the fifth unit on ebay, in which case he is truly shafted.
It sure sounds like they are using the proprietary cable as a form of "hardware lock," hence their unwillingness to provide one.
Jim
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Speaking from a secure undisclosed location.
