Recover Deleted Mac Mail Trash

Is there any way to recover items that were deleted from Trash in Mac Mail Version 5.1? I saw some solutions on the forum but they were from 2007. We are running Lion Version 10.7.2.

I do have a Time Machine backup from a few weeks ago that I can use if there is no other solution. I have never restored anything from Time Machine so any hints would be appreciated. This is on an iMac 2.7 GHz processor.

Thank you in advance!