You’ve probably heard that having a “full set” boosts a Rolex’s resale value....

https://highstylife.com/do-i-need-a-certificate-of-authenticity-when-buying-a-watch-on-a-cruise/

You’ve probably heard that having a “full set” boosts a Rolex’s resale value. But here’s the truth: the warranty card is the real star. While the box looks nice, it doesn’t add much to the price