According to the Oxford American Dictionary, "a pig in a poke" is something that is bought without seeing it first (with reference to the formerly common trick of selling a cat concealed in a bag (poke) to someone who was expecting a pig.) It is apparently a centuries old piece of advice to unwary shoppers. When one went off to market, they had to be certain to check the contents of the sack they were handed, less they risk being defrauded by an unscrupulous merchant.
Does this pig look unscrupulous to you?
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