He keeps his old comic books in mint condition.
mint condition
idiomThe condition of newness or perfection, as if just freshly minted.
Origin
first recorded 19th c.Originally, the phrase comes from the way collectors described the condition of coins coming straight from the mint (coin factory). First use appears c. 1897.
The collector was happy to find the vintage watch in mint condition after all these years.
Despite being manufactured over half a century ago, the rare automobile remained in mint condition, preserved meticulously by its original owner.