In mint condition
Definition 1 of 1
Pro Tip 1/3Metaphorical Use
Used to describe perfect condition, not only for physical items but also abstract ideas like a plan. 
Their strategy was in mint condition, flawless and well-prepared.
Pro Tip 2/3Not for Services
Primarily used for physical, tangible items; not suitable for services or processes. 
He collected stamps that were in mint condition, not postal services.
Pro Tip 3/3Value Implication
Items in mint condition are often considered more valuable, especially collectibles. 
The comic book was in mint condition, which justified its high auction price.