I took Dad to the location of the cache that I couldn't find several days ago, and he wanted to search some more, but after a good amount of time, he agreed that it couldn't be found. We then headed to the next location, which we were able to log successfully.
Afterwards, we worked on the cache that was just down the street from Wanda's house. It was a little tricky to decipher, but Dad had the best idea, which eventually led to it's discovery. I'm glad we found it, it would probably have bugged me for a long time - it being so close, yet so far away.