It's easy to know if a post is missing when you are doing a 365 project. In this case I was looking for a posting. The photograph is there in the album (I did not upload an image without making a posting about it). But the post is missing. #26/365. That is the one I found to be missing. I have not checked others, but I am pretty sure that there will be others.
How do we recover missing posts, I wonder? This was an issue that was around in 2012, which seems to be ongoing.