Serial Number Plato Dvd Ripper Pro 6.66.5 Where Can I Check The Serial Number On My Coach Bag?

Where can I check the serial number on my Coach bag? - serial number plato dvd ripper pro 6.66.5

I bought two bags and I have a good experience and knowledge in a knowledge society with fake bag marks, but I'm looking to prove a bad friend (who does not believe that this really is) the bag, to be true because I Plato's Closet bought, and someone has owned before and I moved in that if someone couldtell that I check the serial number, whether I would be very appreciated. Thank you:)