Another thought on universality (is that a word?) of definitions. There are many forms of the word "New" that can be easily understood by potential buyers if the seller is clear in his or her communication.
In simple terms, "New" (to me) means "New, unopened, and unused" or "New in box" like I would expect to find the item in a retail store or if I were to buy directly from the manufacturer. All shipping materials and literature should be included if the term "New" is used by the seller without any modification or explanation.
If the item has been opened only for inspection purposes, then the seller should describe the item is "New and unused, but opened only for inspection". If the seller does not have the original packaging, then he or she could add, "I don't have the original packaging". Tell it like it is!
If the item has been used in any way, shape, or form (even if for a 5 minute test) then the seller should describe it as "As new" or "New demo" or whatever phrase best describes the reality. Audiogon ads are not priced per word!