The sponsorship campaign with eBay we ran on PurseBlog is an effort to showcase their new authenticity guarantee and new item store that was recently opened. I can't speak on the seller that curates the product, we have no information in that regard. We aren't endorsing a particular seller, we're aiming to showcase eBay's authenticity guarantee.
Every iteration of their 'authenticity programs' over time has been grossly flawed. Some of the sellers involved have been caught knowingly selling counterfeits. Some were known to claim they never received items sent to them. In some cases there have been claims they switched items and sent counterfeits back to the person that sent a genuine item.
There is nothing to be trusted in any of their programs.