They don't. That's why people waste time sending each other useless strange parts, because a rumor starts and everyone is convinced it's true. They end up with tons of useless parts when the update comes because they've tried to guess instead of just waiting. This happens every single holiday. I wish more people besides you and I knew that guessing doesn't pay off. At least the chili peppers and sombreros make sense, though, because everyone is so mad over the puebla glitch. Usually theres absolutely no rhyme or reason to the rumored parts lol.