No, not "zing". I know the Duo came with pack-in games. I purchased mine from a now-defunct shop known as Cart Mart in Cedar Rapids, Iowa. The price was 240 after shipping. I remember calling them and asking if it included the 3-in-1 CD and was told, "We take them out and sell them separately." Also absent from my system was the paper sash that wrapped around the box and which advertised, "$250 worth of software free". I don't know if any of you are familiar with that place, but below are a couple of old posts that make mention of it back when it was still around.
By "unopened" I'm referrring to the individual parts: the deck, TurboPad, power supply, etc. I did open the box upon receiving it, but that's obvious (who wouldn't?). The system is unplayed and the box is without even the most minimal damage. I have it sealed in an acid-free, clear plastic bag, which itself is inside a plastic tote box.
https://groups.google.com/forum/#!topic/rec.games.video.sega/HQQg_Ybo7lk
http://www.ign.com/boards/threads/the-official-tg-16-thread.11300033/#post-11518214