Lionel Postwar 6464-400 B&O Time Saver w/two Different Built Dates Boxed

Lionel postwar 6464-400 Baltimore & Ohio Time Saver Service type IIb with two different built dates in OB. One side has BLT 5-54 and the other side has BLT 2-56. The car is C7-8. The OB has all flaps attached.