That was my first impulse but I'm pretty sure I would be in the wrong in that case according to BF rules.
I have sent the seller a PM. Will see what results.
To summarize -
LNIB can be an accurate and broad sweeping description which could include 2nd hand knives but "BRAND NEW" leaves no room for interpretation.
It'd be nice to have some community agreed-upon guidelines for this, although I know there's a lot of subjectivity.
I'd propose something like:
BNIB: Brand New In Box, as received from dealer, unopened packaging.
LNIB: Like New In Box, packaging all present but opened, knife minimally handled but not carried or used.
ANIB: Almost New In Box, packaging all present and opened, knife shows no visible wear but may have been minimally carried or used. I think any knife acquired second hand and then resold could not be reasonably in better than this condition unless the packaging was sealed, since you can't really attest to what the prior owners did with it.
Light User: Knife has been used and carried and may have been sharpened, but does not show any scratches or marks and retains the original edge or has been sharpened very well by someone who knows what he or she is doing on good equipment.
User: Knife has been used, carried, and sharpened and shows wear and tear commensurate with regular use.
Hard User: Knife has been used, carried, and sharpened and shows significant wear and tear, including scratches, stains, minor rust, etc.
As an aside, I did see a recent post advertising a knife as LNIB with the caveat that the seller couldn't find the box.
... how is your knife like new in box if you can't find the box, one wonders.