My cars been sitting for the last year and reg is expired. Been out of state working but back now and need to register car. Plates still on but can’t seem to locate actual paper reg... what do I need to do at this point?

I would try renewing registration online see if that works

I guess you may have to re-register the car at the DMV. Found this out " If your vehicle is more then 90 days past its expiration date you need to go in person to the DMV to reregister your vehicle: bring your identification as well as your old registration and insurance information to the branch to fill out the necessary forms"