I have sold stuff that I described as "New in Open Box" if I had examined or tested something about it, without putting it into actual "use"
A seller who got it out, tested the unit for proper operation, and put it back again, could reasonably call it "New in Open Box" in my opinion.
"New in Box" means that it has not been taken out of the box, by my definition.
But maybe I am more lax than somebody else.
Where I'm from, the consumer has RIGHTS ! (And retailers have LEGAL OBLIGATIONS !!)
One of them is that buyers are entitled to see the product, ALSO with their fingers ! (That IS how one 'sees' mechanical quality, is it not ??)
As a result, merchants are allowed to call a product 'New', even if the seal on the box has been broken !.
When buying 'post-order', the consumer has a 14-day return-right, EVEN if the seal is broken ..
The Law can't see how else they are supposed to establish whether the product is something they want to pay for or not ..
Only exceptions are private sales and auctions, here 'purchased as seen (or honestly described) is accepted .