When you buy computer components or peripherals hold on to your boxes! If your item is defective and still under warranty the original box is the best thing to use to ship it. Some companies will even require you to use the original box as they know it will help limit any chance of the product becoming damaged due to shipping.
Another benefit of keeping the original box is if you plan on moving, it can be used to transfer the item safely. The boxes I recommend keeping the most are going to be for the RAM, storage, computer case and the monitor. By keeping the computer case box, it is big enough to fit all your other boxes into so that you only have one place to look in case your computer has any issues.