It depends on the state. NY is messed up, MaB are supposedly completely illegal there and NYC itself is known for confiscating ebikes
Most states don't have a plate for MBs unless you went through all the trouble to legally obtain a motorcycle or moped plate. Most states don't even have moped plates. In California it's really easy to get a moped plate, bike unseen by authorities (despite that, I refuse to plate mine).
Even if you were to have a friend set you up with a legal Cali plate for your bike, the dang things are illegal in NY state. Might make an interesting fight regarding right-to-travel perhaps, if one has the time.