Get a copy of the registration from state 1 and bring it with you. That should be enough.

Make sure you have your insurance company get you a stamped copy of the RMV form that proves you’re insured. You won’t be able to proceed without it.

Also make sure you print out the affidavit form from the RMV stating when you bought the car. The point of sale paperwork isn’t enough you have to fill out their form.