Congratulations! I had 2 girls and then a boy, Boys are so much easier which makes it nice since he is the last one and she/both of you will be tired!
On this issue, don't most women go to their DR. after a miscarriage and surely he fills out paperwork needed for state records such as these? Why do the police have to be involved?
Even if they aren't far along it's always a good idea for a woman in such a situation to go to her doctor. A DNC will most likely need to be done, otherwise they will be at risk for a bad infection.