This came from a guy whose neighbors noticed it up in the garage rafters & asked what is that? He said he got this & a couple other accessories along with a grill, back in the early 1960's (I'd have to take a look & see what year he mentioned exactly). At the time, it sounded like it might possibly have been from back in the Wood Dale years, but I didn't know exactly when they moved to Arlington Heights.
In any event, the box has the Arlington Heights address. I did notice that the box seems very plain compared to many that look a bit newer & has a much simpler depiction of the skewers & ring, so I'm guessing it is older.
For what it is worth, the date 4th class mail was changed to another name was back in the 90's, so that clue was useless. The Elgin Corrugated
Box (the only thing on the back) was acquired in 2001, so that wasn't helpful either.
Thought I'd turn to you guys here & also start searching through old catalogs, just in case there is any depictions of boxes (which I don't recall seeing in one before).