I'm nearly certain they all came with the outer cardboard box. As a general rule of thumb for any system in the 90's or later, if there is no UPC on the jewel case, there most likely was a cardboard box or sleeve on it originally.
Correct for 99% of cases. ^.^
i realised that after posting and looking at my 2 TG16 jewel cases...no UPC
. from a quick glance at ebay it looks like the cardboard is really hard to find for most games, i only saw a handful that regularly had it.
I think everyone does that when they get their first TG-16 games. I know I did, "oh yeah, CIB TG-16 games!"
checks ebay "oh, I guess they're more like 'incomplete in case' than 'complete in box'."