You are not required to send in any chargers, boxes, or other accessories with your IOS device. However, if you do not need them anymore we recommend that you send us what you have as we can always find a new home for them to keep them out of landfills. These factors will not effect your offer.
If you are sending in a Mac we recommend sending in your charger as it can effect your offer. We do not need your box, however it will protect your computer during shipment so we always recommend sending in original box.