I agree with
@Blade_. At this point it seems riskier that it could be rejected if they consider it’s not complete. Of course we have seen people that had no issue with it, but the instructions clearly say you need to include it so it seems easier to have it rejected than not. In that case you’d have to wait a month for the Chicago Lockbox to review your package and then whatever time it takes to get the rejection notice… overall, that sounds like it’ll probably be longer than the 4 weeks you might have to wait for the receipt.
I would, however, start emailing KCC if you didn’t include a SASE just so by the time they get to your email they can send the receipt if that’s something they do (I do know now how they handle this when they don’t have the SASE).
Technically, you should still have time to complete the AOS process… after all, there’s a ton of us that are in the first stages currently