Printed NeeDoh® branding
Every authentic NeeDoh carries the wordmark printed directly on the toy itself or, at minimum, on the cardboard hangtag sealed to the packaging. Counterfeits frequently skip the on-toy branding entirely, or print it in a slightly off font that doesn't match Schylling's brand mark. If the listing describes it generically as 'squishy stress cube' without saying 'NeeDoh' or 'Schylling' outright, that's a red flag.