Ok, and what if I want to renew my IRP later and didn't surrender my plates?
You can do that, but you'll be charged a registration fee for an entire year.
I ask you because my apportioned plates got lost. Is there a way to sort that out so I don't get charged that fee?
You can get a completed form Report of Lost or Stolen Motor Vehicle Items MV-78B from a police agency and send form MV-78B with form IRP-6.