I purchase a LV off of eBay just a few days ago. The seller stated that it has been shipped yesterday. I asked if there will be dust bag, the seller said no. I then ask that will she accept return if the bag is not authentic since I will have it authenticate once it arrive. she started saying that she does not trust me and she has the tag to prove that it is authentic and I will not able to scam her. should i be worried about this?