I read these threads and I don't get it--must be a regional thing?
I've recieved and shipped literally hundreds of bows over the last dozen to 15 years or so, nearly all in cardboard boxes. They are shipped to me here in the Southeast from Southwest Canada--a pretty long haul from the start. Most of my shipping is within the lower 48, but I've also shipped a lot of bows to AK, HI, and as far away as Hungary, Romania, Australia, France, Italy, etc. 99+% via USPS.
One thing I don't use much of is bubble wrap--I like foam wrap and/or newspaper. If I use bubble wrap, it's in conjunction with one of the other two, especially on the pointy ends--they poke through bubble wrap too easily for me.
I'm not stingy with packing material (old newspaper is cheap). I've had customers tell me their box looked scary when they got it, but the bow inside was just fine.
I do insure every bow I ship, but I've never had to use it. I also always ship via Priority Mail (in the U.S.) I'm confident that, if I did have a problem, it wouldn't be a hassle getting it resolved--nice thing about small town post offices, they really do appreciate your business--at least the two I use do.
I have used carpet cobs for shipping longbows, just because I had them handy. No problems with those either, other than they are heavy and cost more to ship. A good, heavy wad of newspaper wrapped around the tips, then more crammed in on top, will keep it from pushing through the duct tape if you don't have a wood or plastic end-cap.
Chad