You can go to your LGS and see if the have a box that will fit your gun. There are also ~$25 hard sided cases, that when coupled with cardboard outer box will ship your gun nicely. Make sure to take the bolt out and pack it in the case separately, in bubble wrap.
As for shipping to the company, you'll have to ask them. It can be shipped directly back to you, and not thru a FFL as you are the owner.