Regular US Postal Service does the deliveries, but you need to be there to sign for the Royal Post package.
Mine arrived today and are at the shop awaiting (correct) installation. :D
The luthier was quite excited to install them and promised that he would be sure to get the guitar back to me within a couple of days--or so--after he finished. :P
Ha.
I also gave him a Bare Knuckles shirt, as the price he was charging was less than I expected, and he was really, truly giddy at getting to install and give them a go!
Hope your package of wonders arrives soon.