I didn't even catch until today that they'd disappeared as an announcement.
Turns out, unless you tell it otherwise, an announcement expires after a month. I set the new expiration to sometime in the year 2035. :D
Luckily they get PMed to every new registered member, but all the same I wanted to put them back up.
While doing so, I went ahead and revised them as well, so be sure to check them out.