Okay, so after raising this with eBay ( that they authenticated this very same bag in November!!) the authentication team have now come back and said that the bag IS authentic but the reason they failed it was because the description didn’t match the condition of the bag????  They sent me a couple of photos of a slight crease in the strap and some very slight scuffing on one of the seams.  They also said there was “minor debris” inside the bag, whatever that means!! Again, this bag hasn’t been used since they last saw it and none of these supposed “defects” were noted in the original listing when I purchased it.  So because of that they refunded the customer and returned the bag.  So I’ve lost a $600 sale based off a couple of photos!   It’s a USED bag and despite that it’s in near perfect condition.  Makes no sense at all.  Thanks eBay !