I'm getting a little fed up right now. I'm looking at this auction: 150276620682
I know she says not to email her regarding authenticity, but how can you tell from that one picture?
So I contacted the seller and asked her for pics of the zipper heads, name plate and serial tag.
She replies to me and says "Here are the additional pica.Guaranteeted authentic. All markings are correct. Riri zippers.Thanks."
Here are the pictures:
http://www.theness.net/bags/bluemjvenbottom.jpg
http://www.theness.net/bags/bluemjvenbottom2.jpg
http://www.theness.net/bags/bluemjvenside.jpg
http://www.theness.net/bags/bluemjvenlock.jpg
I then reply saying thanks and ask her for the pics again.
She sends me these:
http://www.theness.net/bags/Picture_173.jpg
http://www.theness.net/bags/Picture_174.jpg
http://www.theness.net/bags/Picture_175.jpg
and says:
"Here are the other pics. Couldn't find a serial number in the bag. The last time, it is authentic. Check my feedback for other designer bags.
Thanks for looking."

It looks OK to me, but I can't tell if anything is written on the zippers.