And here is that other shoe that we were all waiting to hear drop:
Well, I do not know the circumstances of this particular situation (i.e. how/when the registration was submitted), but the person who got that letter is up a creek without a paddle.
They are now a felon, with a choice of several bad options for dealing with their situation.
God help them if they get pulled over for a broken tail-light on the way to someplace to take action on one of the options available to them, because they are committing a crime by even attempting to perform them!
Some state legislator was trying to get an extension of the registration deadline, but I haven’t heard anything concrete about that.
The rejection letter:
I hope you gun owners have a plan to retain your weapons despite this idiotic law.
Read the law carefully and the potential wiggle room should become obvious.