How could I have missed that

I've noticed lately that a number of caches that I originally marked as DNF, when I go back to try and find them, they are super obvious. For example, last night the team stopped at a local park to find a cache I had looked for 2 times already. Between keeping WSDrew out of the fountain, and searching for the cache, we quickly found the Altoids box magnetically attached to a fence post.

I stood there with it in my hands thinking "How could I have missed this one".

Don't get me wrong, I miss caches all the time, but some of these "easy" ones baffle me when I can't seem to find them.