Check out AbeBooks.com. They list various editions of this title, and have a lot of them for sale.
I did a quick search on it, entering a publishing date range of 1850 to 1860, and came up with 54 hits. Many of these hits were for individual volumes but others listed all six volumes. The price range went from $7.50 for Volume 3, to $1,250 for all six volumes published in 1853 by H. B. Bohn, London (leather binding). Apparently, this was the first edition.
I didn't see any stating a publishing date of 1857.
There is a lot involved in identifying the quality and value of antiquarian books. For anyone selling such books, the value is only as great as the interest in purchasing it.
It does sound like you scored though! By all means, do take good care of them. They have value beyond any dollar amount.
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