New or Used - which is better for NOS?

Hello all! Newbie with a question. I sell mostly NOS - not quite vintage but close. The packaging is usually sealed/present and condition varies though contents are untouched. So, for eg, a sealed Barbie that's 15yrs old and box has minor wear. Is that new or used? Or a doll with damaged box? Not sure how anything not made within the last year can be considered new but I see others selecting new for anything NFRB. My concern is that if I select new, might be opening myself up to INAD claims. Woluld you choose new or used? TIA!

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Thank you! I'll read that link. I like the idea of used better since the items are technically not "new". Much appreciated!