I'm guessing the submission dates are hidden because they're incorrect. Here's another one[0] that says it was posted in 2011, but there's an ed mark saying that "at this time" meant "pre-2000."

Edit: It's on the wayback machine since at least August of 2000.[1]

[0]. http://www.woz.org/letters/relationship-steve-jobs

[1]. http://web.archive.org/web/20000817233800/http://www.woz.org...