BNIB
BNIB definition by Slang.net
This page explains what the acronym "BNIB" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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Online sellers use the acronym BNIB to mean "brand new in box." This indicates the item they're selling has never been opened or used.
You're most likely to encounter this acronym on eBay, Craigslist, Facebook Marketplace, and other auction and sale websites. It's often used in listings for electronics and collectibles, to indicate these somewhat-expensive items are untouched and in great condition.