Tim: I do have one but sorry, I play the game myself!
Bish: I picked up a Panzer IA off the Dragon website on sale about a month ago and it had a big silver sticker on the cellophane advertising it as having the coupon inside. I'd assume that any Dragon kit would have the same sticker, I have no idea about Tamiya or any other brand.
Still hanging onto mine, going to offer it to one of our tank guys in our IPMS club and see if I can induce him into the cult ... um ... I mean fanbase....