I assume it is authentic though not sure.
http://cgi.ebay.com/100-Authentic-2006-Balenciaga-First-Ink-Blue-Bag_W0QQitemZ6884207711QQcategoryZ63852QQrdZ1QQcmdZViewItem
http://cgi.ebay.com/100-Authentic-2006-Balenciaga-First-Ink-Blue-Bag_W0QQitemZ6884207711QQcategoryZ63852QQrdZ1QQcmdZViewItem