My neighbor is kind of a computer/internet/eBay novice, and she has just asked me to list something on her behalf - a vintage Chanel bag. She says it is authentic - and I trust her enough that I know she would not intentionally mislead me. On the other hand, I know absolutely nothing about Chanel bags, and wouldn't know how to authenticate it. She says there is a serial number inside that absolutely proves its authenticity - but I know that she doesn't know anything about replicas and doesn't believe that a replica could have a serial number too. My question is... would you risk selling something like this for someone else?