You should be able to retrieve the most recent one

You should be able to retrieve the most recent ones. Just go to your mailbox and click on the "my deleted posts" tab. From what I can tell there is a time limit as to how long they are kept in your deleted posts folder. I am only guessing it is on the order of 2 weeks. I could not find anything in the terms of service literature listing a duration. So if you have interest in retrieving them you will have to be fairly diligent about checking it.