The real requirement for the auction is that it have a "clear title", meaning, the car cannot have a lien (loan). MSO qualifies for that. So cars that are still on MSO and has miles, it could be a dealer car (probably owner, with dealer plates). If it was privately owned it may or may not have had sales tax paid (if the purchase was in the same state, sales tax is usually collected at point/time of sale), but the MSO still in possession of the owner would indicate it was not registered. Most auto insurance companies will NOT insure a vehicle that does not have current registration, even for the comprehensive portion (ie, not driven, not presently licensed and stored in a garage). Your howmeowners insurance won't cover the loss in case of fire or theft. I would be curious if Drew's underwriter covers an unregistered vehicle.