I'm not overly concerned by the distance,but if the person with the eggs isn't comfortable there's not much I can do about it.Distance does not matter since they go by air. What matters it the distance from the service center to the airport. Airborne flies them. if the distance is close enough for the shipment to go by truck then USPS will ship via truck. For that reason, hatching eggs shipped from the East coast to California usually do better than eggs shipped from Washington State or Oregon to California.
I hatched eggs that flew from Spain to San Francisco--That is a lot farther than this is.
It is an acceptable risk if the seller knows how to pack the eggs correctly.
Ship the box and packing materials to her and give her my packing instructions. It is a Win Win for everyone since we cannot find good SC RIRs out here.