This Ammo Can is NOT the cache.
The cache is hidden within (inside) the Ammo Can. The Log is inside the cache.
→ Locating the Ammo Can is not the same as finding the cache ←
This Cache is not a Letterbox as in, Letterboxing or Letterbox Hybred but, a Letter Box, nonetheless - LOL There is a puzzle you must solve to unlock the inner door of the Box to retrieve the Log & visit any TBs that may be waiting. This Cache is in Catalina State Park and there is a nominal fee required to get into the Park. Once in the Park, there're several clever Caches put-out by a local Cacher, 'cliptwings'. I encourage you to visit these and other Caches in the area. There are PicNic areas, Restrooms & Parking nearby.
Everything you need, in order to solve the puzzle, is at the Cache. The use of any tool other than what is provided is discouraged but, muttering colorful metaphors under your breath is permitted - LOL
Remember, ya gotta sign that danged Log to claim the find & add it to your stats.. RS Arizona retrieved the Un-Activated TB as a FTF Prize.