I live in NYC but right now in NC. I have booked RDU-JFK-PVG and it requires overnight at JFK. I will stay in my apartment in NYC but can I check luggages ( 2 PC) at JFK the next day even though I have no luggage at RDU? What if I have a piece of luggage checked in RDU, shoud I check it to JFK only?

Thanks.