Thanks Nicole0612 that helps a lot.....I appreciate you explaining it to me. Cannot understand the price difference but their you go plus it does say offers....I checked those listings, it looks like the seller listed it on her own in June 2017 and when it did not sell she sent it in to the concierge service and they listed it December 2017 (for a higher price). It is almost certainly the same dress. VC would not be monitoring Anna's listings so it would be up to her to take down the previous listing, since presumably she no longer has that one since she sent it to Vestiaire. I hope that helps.
