Can I sell my vehicle even without current registration?

Can I sell my vehicle even without current registration?
I sold my car two days ago ”As Is” to a co worker-(we do have a notorized Bill of Sale), the same day the car broke down and he left in on the interstate. The car was towed because it did not have the current year’s tags and decals. He wants his money back because he states it is ”illegal to sell a car without the current year’s registration (i.e. tags and decals) He is threatening to take me to small claim court if I don’t return his money. He paid $1500.00, $1300 cash;$200.00 to a mechanic for minor repairs. Am I covered since I sold the car ”As Is”?

Selling of a car I sold a car to a residence of NC on 12/19.

Selling of a car
I sold a car to a residence of NC on 12/19. A bill of sale was signed however no money was exchanged. The car was given to purchaser on good faith. Credit union was to send the payment to my finance institution. I paid the remainder balance to my finance insitution and was told things would be done bt 12/28. I call his credit union and is now told he doesn’t want to buy the car. I have a bill of sale and everything and he has ownership of car. Isn’t he legally binded to buy the car because the bill of sale was signed as is and I kept my end of the bargain?

Vehicle Ownership dispute I purchased a vehicle in february, The bill of sale…

Vehicle Ownership dispute
I purchased a vehicle in february, The bill of sale is in my name and for tag and insurance reasons I put the title in my mothers name. The insurance is in her name aswell and I am a listed driver. We got in an argument and she called the police and reported that I stole the car. I have all keys,the title, and bill of sale but they towed the vehicle. I know where the car is located. I was wondering what rights do I have to the vehicle and what can I do to get my vehicle back?
Thankyou,