Like already stated, you can try. The folks at the Apple store have quite a bit of leeway in what they are allowed to do to keep customers happy. That said, I believe the "rules" state you have 10 days to return it. I returned my wifi-only model a week to the day and upgraded to one with the LTE radio in it and had no problems whatsoever.
Also, if it is jailbroken, make sure you restore the device back to a new iPad before taking it in there.