Boxes, for sure.
I'm also not sure what happened to my TurboDuo games. I know I'd loaned it out to one of my brothers and don't recall getting it back, but he insists he did. I moved sometime after I loaned it out and tossed what I thought was garbage in the basement of the old place, so I'm afraid one of those may have contained the Duo (but I'm praying that wasn't the case...)