I was let go at work for “costing” too much. Can an employer clean out my desk (I bought and own) and get rid of all my documents without my permission. Also can he go through my PERSONAL email and delete all my stuff?

I was let go from work on Wednesday the 3rd Of September. I walked into my office and my whole desk was cleaned out and all my stuff placed in bins. Now keep in mind, I purchased this desk, it was not supplied by my boss. I am missing all my personal documents ranging from doctors letter, divorce letter and other important docs. The next day, I go into my personal email used for work and personal reasons including talking with my doctors (because he never gave me an email to use) well low and behold he went in and deleted everything and then went into the trash file and permanently deleted everything again. What can I do??