Guys, I had 3.2.1 on my Kindle. Upgraded manually to 3.3 but existing personal document (one book only) still didn't show up among archived items. Deleted that book from the cloud, send another book to
name@free.kindle.com. Received this book on my Kindle, deleted it (Kindle said "remove from device") (with WiFi on). Removed item immediately "jumped" into Archived Items folder.