Dmv question

So I am turning my plate in on the Milan tomorrow(I am lazy). Does anyone know how big of a deal it is if you only have one of the license plates? The other on was lost In the accident. I also do not have the registration but do have a police report from the accident. I have never done this before.

my dad likes to keep a plate sometimes and say the other one fell off you should have no issues

U had all day to say something. Now you tell me.