Nebraska Revised Statute 60-365
Operation of vehicle without registration; limitation; proof of ownership.
Any person purchasing a motor vehicle or trailer in this state other than from a licensed dealer in motor vehicles or trailers shall not operate or tow such motor vehicle or trailer in this state without registration except as provided in this section. Such purchaser may operate or tow such motor vehicle or trailer without registration for a period not to exceed thirty days. Upon demand of proper authorities, there shall be presented by the person in charge of such motor vehicle or trailer, for examination, a bill of sale showing the date of transfer or the certificate of title to such motor vehicle or trailer with assignment thereof duly executed. When such motor vehicle or trailer is purchased from a nonresident, the person in charge of such motor vehicle or trailer shall present upon demand proper evidence of ownership from the state where such motor vehicle or trailer was purchased.
Pursuant to this section, one can lawfully operate an unregistered motor vehicle for 30 days without display of license plates or in-transit tags after purchasing the vehicle from a nonlicensed seller, provided one can produce the proper documentation upon demand. State v. Bowers, 250 Neb. 151, 548 N.W.2d 725 (1996).