Edge Hates Challenge Cache Mystery Cache

This cache is a Challenge Cache and the cache is very near the posted coordinates.
Say, what's about the coordinate nearby? 
In order to log Found you must:
Complete the Challenge. Find the cache and sign the log sheet.
In order to fulfill this challenge, you must have found at least 25 challenge caches.

20230317 Note:

因為台灣有些挑戰寶達成的可能性實在太低 （Edge的挑戰寶則是假以時日就會過關的），想了想還是來改寶名好了