I've found only one bound copy thus far on Worldcat, at the British Library:
http://www.worldcat.org/title/law-of-nations-translated-from-the-french/oclc/504684014
They've been non-responsive to any requests.
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Is anyone near Boston??? A trip to the "Social Law Library" on the 4th and 5th floors of the John Adams Courthouse could prove useful.
"Original Shelf list of the Social Law Library in Boston, Massachusetts:
The Social Law Library of Boston, Massachusetts is one of the oldest law libraries in the United States. It was founded in 1803 by a group of eminent Boston lawyers who pooled their resources and sent an agent to England to acquire law books and bring them back to the Commonwealth. The agent returned with the following set of books in 1804.
The library has grown over the years and is now a very large law library on fourth and fifth floors of the John Adams Courthouse in Boston.
This shelf list was provided to me by one of the head librarians at the Social Law Library in March 2009. Most of the books described are still available for use.
108. Vattel’s Law of Nations (1759)"
http://www.librarything.com/topic/62348
Apparently, a copy can also be found at the Boston College Law Library:
http://openlibrary.org/b/OL18683993M/law_of_nations_or_Principles_of_the_laws_of_nature
More copies of the 1758 Law of Nations can be found at:
UT Austin, Perry Castaneda Library, Austin, TX
The Library Company of Philadelphia, 1314 Locust St., Philadelphia, PA