Judy,
There has been some database work and clean up that has been done. It is possible some very old posts have been removed. There really isn't a way to pick out your posts and selectively restore them.
If that is what happened I'm sorry for the loss of those posts.
In 2004 there was a "glitch" in the old, old boards where a duplicate user could be created using different case letters. Our board developer said that this "glitch" didn't exist so I created a username of "mike m" and made a couple of test posts. When I proved my point and deleted the "mike m" username it also deleted my regular "Mike M" username. I lost all of my posts. There were over 10,000 of them. I wasn't happy but there was no way to selectively restore them. At least I proved that there were two "glitches".
Take care,
Mike