I really missed out on the stock cars. Many of the boxcars were offered punched with slots or embossed as stock cars. Being as I got into the modern Marx a bit late, I did not pick any up direct from the company and they were selling for much more than boxcars on the aftermarket. As a result, I only have a few. In fact I have more from Joe's Trains than I do from Marx Trains. They still seldom show up.
Steve