Post Disappeared

Hello,
I have a community food blog, and a post that was written a few days ago from one of the writers has disappeared completely.

It was there this morning, and the strangest thing is that the comment from the post ended up in a post I wrote this morning. This would mean that somehow my post merged with the now-disappeared post?

Here is the URL to the post, now disappeared, which now says “Page Not Found”.
http://www.umamimart.com/2010/02/17/happy-hour-hot-buttered-rum/

Here is my post from today, with the comment from the disappeared post. It’s the strangest thing!
http://www.umamimart.com/2010/02/19/postcard-from-nyc-grand-central-oyster-bar/

I have tried recovering the post from the the trash, under Admin, everything, and the post is nowhere to be found.

I upgraded to 2.9.2 about two days ago– could this be a factor?

Please help! It is very important that this post is recovered, since his column is widely read.

Thanks for any insight.