Returns
Can I return my iPad for a full refund if I have already opened my iPad?
iPad Air Wi-Fi
If you purchased it directly from Apple, you have 14 days to return it for a full refund even if you opened it. However, you will,have to include any accessories that came in the box with the iPad.
If you bought it from a third party reseller, you will have to contact them to see what their return policy is.