the last picture tube someone sent me, it was a 16rp4, and I paid and made the guy go over to staples to have them box and pack it. it arrived, it took me two garbage bags, and an hour of packing penuts to just to get to the pins of the CRT. I knew it made it, and it did.
just get a dryer size box, and heavy rock solid packing, with about 6 inches from the face of the tube to the box, and 6 inches from the box to the CRT pins.