I’ve just had the most disquieting experience. I was working on a file in my inbox, hit a key combination (opion-h) to activate a script (to convert a bookmark to an html page), only I might have hit a slightly different key combination because … every file in my inbox suddenly disappeared. Didn’t go to Trash. Didn’t move to any other database or group. Just … vanished. Tried to undo. Nothing. Looked everywhere I could think of. Nothing.
A screen capture of the Database Properties could be useful.
It’s not clear what has happened or if anything actually needs to be rescued yet.
Hold the Option key and choose File > Restore Backup. Choose the earlier date (as the Rebuild added its own restore point). Does that show the files?