Hire A Box uses strong cardboard in the manufacturing of their boxes. Due to the strength and durable nature of the boxes, they are generally hired a few times prior to being sold. Therefore, if you buy boxes from Hire A Box they may have been used a few times. We do not sell boxes that are unuseable and ensure all boxes sold are still structurally strong and fit for their intended purpose. All boxes hired out are also generally re-hired a few times.