I mailed all of my barely used books back in excellent condition about 6 weeks ago. They received it a couple weeks ago. I just got an email today saying that two of my books were missing and that they were reducing my payment. I called to dispute this and the person I spoke to was completely rude, called me a Karen for complaining that they would not provide proof (like a picture) that the box came with two less books than were sent. I asked to speak to a manager she wouldn't allow that, said she was the manager. Said I need to take it up with the shipper and that this happens all the time and there is nothing they can do. DO NOT USE.