Congrats, the older model 36 and 60's are great guns. As far as getting an original box for it, unless you are a serious collector, or this gun will be put away as a safe queen and never be shot, I wouldn't bother. You can spend some pretty good money on an original box and tools. I can totally understand why some people like having the original box and all that, but to me personally it doesn't matter.
By the way, did you ask the fellow you got it from if he has the box? Also if you are interested in the exact date for your gun, there is a Sticky on the top page of the revolver forum where you can post your serial number. Alot of members here have the S&W books that can identify exactly when your gun was made.