This cache is not at posted coordinates. It can only be found when you have completed Adventure Lab cache Belly of the Carp.
Download the Adventure Lab app in your phone and discover 5 virtual locations. When all 5 locations are found, you will have the coordinates for this cache.
The Belly of the Carp Ad Lab gives you a glimpse of the "charming Orient" that was the Singapore River hundreds of years ago. It's an easy walk of 1.2km and takes 1.5 hours to complete. When done, your profile will reflect 5 Adventure Labs finds and one mystery.
You can validate your puzzle solution with certitude.