I saw this on a website: If not provided, ask for a date code (some call it a "serial number," although this is erroneous). There should be 6 characters in total. The first 2 characters will be letters and last 4 will be numbers. If authentic, the 3rd character (first number) will not be higher than 1. The 4th character (second number) will not be lower than 8 with the exception of 0. The 5th & 6th characters (last two numbers) can be anything from 0 to 9. Have I confused you enough yet? (from http://omgoddess.ms11.net/mepage) Is this accurate? About the second # being 0 or 8 or higher? I was looking at an item on ebay, and the date code is SD0705 but it comes with a receipt, but according to that info, it's an invalid date code?