If you get a generic whip off of ebay, I know it comes in a nondescript package. Anyway, there's nothing illegal, or even against fire codes, about a whip. If anything, it'll probably be labeled "tubing"...and if it's labeled a whip, the people in the mail office will just think you're kinky, at worst.
EDIT: my bad, I thought you meant the whip. long day of work. Same deal, only without the kinky joke.