I just bought a boxed Model 38, in nickel. Serial# J859xxx. It has been stored in the box, inside a safe for several years. The nickel finish is not shiny, as there is a light fog over the entire gun. It does not wipe off with oil. Is this normal for a nickel gun that has been stored? What can I use to clean the gun that will not leave swirls or scratches? Also, any thoughts as to when this gun was made. Thanks, Skip48