1.
unused but second-hand item; like-new item
A product that has never been used but is sold as second-hand, typically because the packaging was opened, it was a display model, or the original owner never used it before reselling. Common in Japanese resale markets.
Usage
A compound of 新 (new) and 古品 (used item), describing the in-between status of items that are technically second-hand but have never been used. Very common on Japanese auction and flea market sites like メルカリ and ヤフオク.