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Shipping tanks is a real pain in the ass as the carriers consider them hazardous materials, and the shipping location you take it to has to be certified to ship hazardous materials...
You can get tank cartons, some dive shops have them, and empty the tanks, (if you are going to Hydro, let the recipient do the VIs & fill.. ) its OK to ship them empty. (you can leave a little air in them, - just short of empty)