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Brand New In Box. Often used in auctions and sales, particularly online.
Auction title: "Adidas Superstars. Mens size 111US BNIB"
by Samuel March 14, 2005
Brand New In Box
Oftem used on internet auction websites:

e.g. "For Sale - Computer Headphones B.N.I.B"

Sometimes abbreviated to B.N.B. or BNIB
by romava July 21, 2009