You should send your books within five business days of when the buyback quote was created. In extreme cases, USPS Ground can take up to 3 weeks for delivery. If we do not receive the books within 14 days from when the order was placed, we cannot guarantee the quoted price. After 6 weeks your order will be cancelled. We may still pay you for the books, but they may not have the same value they did when the order was placed. Instead, your books will be received at the current value, which may be different from when you originally submitted your buyback.