I have both the PRS-600 and a 300. They both have stickers on the back with the serial numbers and bar codes. Both were recent purchases. Perhaps the first ones did not have the sticker?
Go up the food chain. Send an email to Sony headquarters in Japan complaining about your treatment at the hands of their American division. I have found that this often works with Japanese companies. Don't ask how I came to believe this -- LOL
The Better Business Bureau is worthless for the consumer. Remember: their middle name is "Business."
Good Luck,
Joe
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