Published entries gone?

I am using MT version 4.12, and on just some of my old entries, the content, what I wrote, is completely missing.
Take this entry for an example, http://www.katjcooper.com/2008/07/he-needs-a-swift-kick.html
I can't even pull up a cached version of the page. http://74.125.47.132/search?sourceid=navclient-ff&ie=UTF-8&q=cache%3Ahttp%3A%2F%2Fwww.katjcooper.com%2F2008%2F07%2Fhe-needs-a-swift-kick.html

I don't understand why this happens, and ONLY happens to some entries.
There are 427 entries, 408 through 427 are all there, but once I get to entries 389 through 407, all of the content is totally gone.
It's not in the published pages or even in my MT entry database, they are all just gone, and then randomly throughout my archives.

Does anyone have the slightest clue why this has happened and keeps happening randomly?
I would really appreciate the help if anyone knows why this is happening.
I tried finding my entries by using cache and the wayback machine.
Please help me if anyone can.

Thanks!