I'd love to mail these from NY to someone in NC, but I'm worried that after 48+ hours they might not keep. Would they survive 2 days of shipment?...

Hi Cookies&Cakes, the scones should be fine for a couple of days. They contain a good amount of sugar, which acts somewhat like a preservative. Wrap them well in a wax paper-lined box or tin. I would instruct the recipient to use the scones immediately, and warm before eating in a 350 degree oven. Freeze the unused scones. I would skip the sage leaf on top if you are planning on shipping.

Possible solution - make, shape & freeze.
Then ship with dry ice to the NC people and let them bake.
Have a look at this article (no endorsement, just for info):
https://compass.ups.com/tips-for-shipping-with-dry-ice-or-gel-packs/