One type of label was handwritten, later they used a different type that was printed by computer. Some had both, one on each end of the box.
The thing I am seeing is that some sellers, in an effort to make everything appear original, are buying period papers and modern labels and putting them in boxes that were not original to the gun, to make the whole package appear "LNIB" or "ANIB."
Fake labels used to be easy to spot, but the forgers have gotten better. Now, you have to guess based upon condition and "yellowing" of the label. A bright white label on a box when all of the interior papers have yellowed in the last 30 years is a dead give away.