If you use a styro container, try wrapping the bottles with newspaper to reduce the tell-tale squeak that screams out: "Hey there is wine in this box." Double boxing is always a good idea too. If you need to list what is inside list things like olive oil, but I also just print the label online so I just drop it off. No questions asked when you do it that way. Also, don't insure it as you would never be able to make a claim on it anyhow.
k.