Kind of interesting, but very much along the lines of the mis-information that Gibson has been sending out lately, especially to bass owners. The current owners, and employees who are several generations removed from Kalamazoo, are a bit in the dark on basses and their guitar models. The "2" is a factory second stamp, which was very common in the 60s and very early 70s. These had finish flaws typically - non structural and non functional flaws that allowed dealers to offer Gibson instruments with a discount. Over the past 40 to 50 years it is very hard to tell what was the problem due to age.
However the idea that the 2 stamp indicated a serial number had been used twice is not only a new story, but just nonsense. The folks at Sam Ash, and every Gibson guitar dating book written in the last 30 years, were right - not whoever sent you that from Gibson.
Now if you get a double neck that looks like two different guitars have been sawed off and glued together, and Gibson tells you it is from 1962....check here first before you put it on ebay.