I have known several girls who bought Chloe and BAL from Overstock.. more recently. Bags came w/ security tags. There was an issue "ago" with Overstock, Smartbargains, even Bluefly... buyers who bought bags, then returned a fake, and then the fake was re-sold. It is my understanding that all of these companies have made an effort to combat this problem via the use of security tags.
IMO, unless you purchase directly from the manufactuer or an "authorized reseller", you need to post pix of your bag and have the actual bag authenticated once received.