I am SURE(ish) that I've stolen the Carob Nut before. PAL version, btw.

Not actually an error, but I've found most wikis/guides/walkthroughs make no mention of finding FF8's Queen of Cards late disc 3 or disc 4 at the escape pod crash site. She has all the rare cards you can obtain from her by doing her sidequest with her and all you have to do is beat her to get them. It's a much easier way of getting the cards. She uses Lunar rules but save beforehand and play cleverly and it's not too hard.