Unfortunately the only way to be sure is if it was sold to you as a YB and the parents can be visually verified or you prove it out by breeding it. Because of the variance in YB's appearance it can be hard to visually tell. You can say that it looks like a YB, but if you sell it as a YB and it doesn't prove out then that's your reputation on the line, then again there are some people who don't care. it's just one of those morphs.
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