I've had lots of boxes from across both ponds. The safest and least-damaged boxes always came using the fastest method, so if they're using 1 day or 2 day shipment, I wouldn't worry too much.
If someone went cheap and went with like 1 week shipping or more (if that was an option, which I don't think it was), then I would worry.
I'm not much worried about the shipping, but I wish I can just go and collect.
Unfortnatelly I can't think of a way to make sure my miners don't die while being handled.