I think this is more of a problem with an incomplete scenario. You do not state the location of this transaction. If you are outside the city limits , there is no law that can force you to register the transaction if it did not occur inside the Lincoln city limits. I traded for a CD 1911 at the fairgrounds ...note that is state property... no registration was ever done, nor in my opinon required
9.36.030
Report of Sale of Firearms.
Any person, firm, association, or corporation dealing in firearms of any type shall, on the
same day of the sale of any firearm, except a shotgun or a rifle of a type commonly used for hunting,
report the sale to the Police Department on forms as prescribed and furnished by the Police
Department. The report shall contain all the information requested thereon. (Ord. 15625 ?3; July
9, 1990: P.C. ?9.28.025: Ord. 15443 ?1; February 20, 1990: prior Ord. 7936 ?1; December 26,
1962).