I hope you can get them back. I do have a lot of old stories on here too. I'm not truly proud of them but they are sentimental to me (which is why I did not delete them)
The staff wouldn't have deleted your stories. The only exception would have been if they were what we call non-stories, such as a massive 'co-write' where everyone posts a confession or a secret, author's notes posted as stories, blogs posted as stories, etc. I have checked our story reporting thread and your stories were never flagged