"The only real difference between the men and the boys, is the number and size, and cost of their toys."
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Do not listen to the guy that says not to tell the shipper what is in the boxes. That is a big "no-no" and make sure they dont put any ammo in the boxes with the guns.
I have had guns shipped across the country before and the only time you have to use an FFL is if the gun is being transferred to you from another person. You can mail a gun to yourself without the usage of an FFL. As for wills, that statute looks pretty clear. The executor should be able to break down the guns, box them up, and ship them directly to your door. Just have him contact the USPS in the local area were the guns are at and they should be able to help you out.