Letterbox (Days of Month) Challenge Mystery Cache

Letterbox hybrids are a unique type of geocache that combine elements of traditional letterboxing and geocaching. Like letterboxing, they include a rubber stamp that finders use to stamp their personal logbooks. The blend of both activities often adds an extra layer of creativity and challenge, as letterbox hybrids may also involve following clues or solving puzzles in addition to using GPS.

For this challenge, you need to find a Letterbox Hybrid on every day on the month (1-31). They do not have to be in the same month, and all previous finds count.