Board Thread:Club Penguin/@comment-15305799-20140320024324/@comment-4500149-20140404013633

Yes, you would still have Rocky and CeCe in your buddy list. However, the names don't appear and the player cards do not load. If I had to guess, they were removed because Club Penguin is never going to use them again. The April Fools' joke was most likely done with Google Chrome Inspect Element. Either that, or it was edited with an image editor. The message looks like an error message to me, so feel free to add it to List of Error Messages. I do not know of a list of "unlockable-only items whose codes have now expired", but you can test the codes on Club Penguin Wiki:Items if you please.