I have never seen a Colt letter stating anything other than the pistol was "Shipped To".
As to the marking on the box, it could mean anything. I have a Colt letter stating that the pistol was shipped to Captain so and so. Was he a Captain in the Military, Navy, local fire department, Salvation Army? Do we know that Major Paloff went to Korea? A letter would probably answer most of the questions on the pistol, and a slim chance on the owner.
I have another Colt letter stating the pistol was shipped to a certain town in a certain county for the sheriff with the sheriff's name. No speculation at all who the pistol went to.