JoskeVThere are many rules and regulations regarding the shipping of flammable/combustible fluids. As a result, these are shipped to us from Zippo empty, and we ship them to you also empty.
If you want to read a little bit more about the shipping constraints:
http://pe.usps.com/text/pub52/pub52c3_018.htm
Overall, it's just not worth it to ship these with fluid in them due to all the restrictions/stipulations involved.