It is always difficult to smuggle a banned book into a country in which it is banned, particularly when said banned book is Victor Hugo's Napoleon-le-Petit, which was obviously critical of Napoleon III, who exiled the author, and that country is France, ruled by said Napoleon III. Hugo's work reached Paris:

-tucked in barrels of hay
-wrapped around tobacco leaves
-stuffed in carriage clocks
-sandwhiched between two sheets of metal, i.e. as a sardine
-in bundles of pages strapped to the legs of tourists in baggy trousers
-hidden in the bindings of prayer books
-in women's garters

Perhaps the most outlandish method of dissemination reads like something out of Dumas novel, though it comes straight from the French Foreign Office:

"The latest mode of clandestine transmission consists of small balloons fashioned from sheets of printed paper which will be launched whenever the wind stands fair for France."