You must bring all appropraite items as well as ID to a local branch.
If it is within 60 days of lapsing, you can just come to a branch.
It has been more than 60 days.
You have to go to the branch where you originally got them, then, with the necessary information and credentials.
Though it sounds like you have a basic idea of the necessary requirements, so just make sure you go back to where you got them from in the first place.
Do I have to get rid of liability?
I can not recommend or give advice about coverage, I can only direct you to the relevant authorities.
Can you tell me what those are?
Please reference our website in the "Contact" links and it will show you the relevant areas.
Do I have to have them destroyed or can I keep the plates?