I just answered your same question in the Jan Filers thread!

TracyTN's thinking was what I was referring to there. I would think, however, once you knew for sure that they'd posted packet 3, you could preemptively send back the forms - then they'd just cross in the mail. But that would be fine. The key is likely to just make sure they have your information all set up so they don't end up with stuff that doesn't match a thing and gets binned.
And yeah - I've seen a couple of people from different embassies/countries posting on specific questions like this one here and, while it's interesting, I kinda with they would disclaim or highlight the differences because embassies really can be very different in how they operate. I'd hate to see people get confused because they missed the different flag in the sidebar!
Not to mention, it just generates urban immigration myths, if that makes sense. People end up thinking they read something somewhere and then that turns into the God's Honest Truth and is really hard to undo later.