I scored a tg16 lot and when I opened up I found four games with a sticker on the clear part of the case that says Promotional Item not for individual resale. At first I though whatever, but then I got to thinking, the colors of the stickers are dead on for tg16. So I investigated more and I found 5 games with some kind of serial number on the back of the hucard, very small, all start with letter A then have 5 numbers after it, i.e. A90921. If you're looking at the back of the card, these embossed numbers are just left of the pull arrow and under the patent text. What I need to know is if the serial number appears on hucards that aren't promo or whatever. Also, has these ever popped up before? I'll upload a pic later.