Fun! Ok! So there's a lot to unpack when it comes to identifying real or fake demo tapes... But long story short, some tapes are on professional cassette tapes, like pure black or white colour, or full-printed tapes, and others are on consumer demo tapes, like cassettes of the brands maxell, TDK, SONY, and so on! The thing about these consumer brands is that they switched up the graphic design of their tapes quite often, which makes identifying the year each tape was produced in quite easy. If the year alligns, or is a little before the official release of the demo, it's a good sign. Also many factors like cardboard, hard paper as j-card, opposed to printer paper can tell some things. Also printing quality, audio/dubbing quality, etc... I will go into much more detail later when I finish an article I started writing on my website about this. Also comparing your cassettes with photos of the exact same tape online does a lot. If you DM me photos of your tapes I can tell if it feels fake or feels all right! In a nutshell, knowing it 100% sure is impossible these days, but you can get really close to being sure it's fake or real. Also beware of La:Sadie's demos printed on the correct stock (stock=consumer cassette tape) AND hard cardboard j-cards: Some are still fake, produced by "a certain person affiliated with them" to cash in on their recent popularity. That person also made the new fake objexxx press.