Givenchy Antigone bag

Givenchy Antigona bag, I bought it at a consignment shop. Therefore I cannot guarantee authenticity. I paid $1000 for the bag. I did check the markings in it does have the markings of the 2012 version which is the date code inside because I cannot guarantee it’s authentic. I am selling it at a very low price. I will only sell things that I buy at the store as authentic, but if I buy the consignment shop, I cannot guarantee and I won’t sell as such.