Goddamm, Unless the car is paid off, you can Not reduce the premiums. When I returned my plates DMV, I did not get any receipt. It might me just a paper saying you have returned the plates. You can always mail the license plate to DMV. DMV in my states is closed and I’m not sure what’s up in your state.

‘’The issue is he is in lockdown state so he can't go and get receipts. He gave me the option of canceling my registration online. he has no issue garaging it in house’’.
If DMV is open he could directly call them. Write a letter attached with license plate and mail to them. Send in a certified mail so you could track. Request they sent u some paperwork saying it is returned. Are you sure DMV office is open? Cancelling whose registration? The car is in his name right?