I sent Threadflip a Full Service bag of items to sell. They refused to take some of the 100% authentic Tiffany & Co. Jewelry because they said that it was "counterfeit." It is not. I have asked them to return all of my items free of charge multiple times and I never get a response. Sellers: DO NOT send your items to Threadflip. I have used their competitors ThredUp and MaterialWrld and they are much, much better. They clearly have no ability to tell whether goods are real or fake.