Lake City first loaded the M118 Match in 1963 (designated XM118). Although M118 was officially adopted in 1965, LC cartons continued to be marked XM118 until 1966.
There is nothing particularly collectible about cartons of LC 66, Lot 12053. They usually fetch about $15 per unopened carton , when sold in quantity. If it's the original steel box, correctly marked, add $10 or $15 to the total.