My Posts have Disappeared! 404 error

Hi everyone, Two of my posts have disappeared! Clicking on their links just gives a 404 error page, and I’ve been told that the pages can’t be accessed because they are in the Trash. But they are not in the Trash – on my Post Dashboard they are alive and well and published. Any idea as to what may have happened, and how I might retrieve them? Maybe it’ll be easiest to actually eliminate them, and rewrite/publish them again. What do you think? The missing page links are right there in the sidebar: The Paleo Diet Explained, and What’s So Good About Paleo. Thanks for your help.