Heh... just though of something - Devs: imagine the chaos it would cause if after one patch the personal stats page included "Secret Packages Found: 0"
There wouldn't be any packages of course, but there'd be people jumping off bridges to check underwater for them, etc. etc.
Then a couple weeks later, remove it. In the patch notes, write "Because no one found any secret packages, we are removing them. They may be back later."
Repeat as necessary. NEVER write in the patch notes when it is put in again.
Perhaps you could make an account, as Devs, build it up for a while as normal, then on the server-wide "Secret Package Top 100" Put this character as having found 100 of them. Stop playing the character. Everyone else has 0 except for this one guy who hasn't played since about a month ago. Hilarity ensues.