I had to Google that gun because I didn't even know S&W made a 32 ACP. According to the website I visited they sold less than 1,000 of them. The chance of finding an original box is probably very slim and even then it is most likely still accompanying the gun it came with.
My advice would be to appreciate the gun as is. It's rare piece of S&W history and not having the box doesn't diminish that fact. Congratulations on your find.