"Jake0748: When you pay your yearly fee for your plate, you also get a slip of paper to keep in the car which has your plate number on it. I guess so they can tell if you just swiped somebody else's plate."

You are correct jake0748, the same goes for Minnesota, when re renew the plates/registration each year we do get a slip of paper, but it's considered a receipt for the registration stickers we put on the license plates.
I've never heard of anyone saving these receipts, at least for any length of time. If we have the stickers on the license plates, that is the proof that we paid for our yearly registration.I've never heard of anyone being asked for that receipt and I've been the passenger in a few cars that have been pulled over.

"Jake0748: I was wondering about that "we don't have registration", comment too. How about it wendizzle? I mean how does the gummint in MN keep track of who owns what car? (Don't even try to tell me they don't)."

We have a title that shows we own the car, but we're supposed to keep them out of our cars, tucked in safe deposit boxes or fireproof safes or in a pile of paperwork on the dining room floor etc. If someone broke into my car to steal it and the title was in there all they would have to do is take the title to the DMV and say they just bought a used car and now they own my car.

To make a long story longer, the state of Minnesota does not give us proof nor require we carry proof of car registration.
When someone is pulled over, the "gummint" as Jake0748 so eloquently put it, has a database that the police use after running the license plate. If the driver's license doesn't have the same name or last name as the database, I guess the police will have to take your word for it that you're driving Mom's car.

In Minnesota we don't have "registration." If pulled over we're asked for license and proof of insurance.

So, if I'm pulled over in a state that has "registration" and I don't have any - am I in more trouble?