Update after clarification in comments: It seems the real question is the procedure for this divinatory practice. I suspect that that is off topic. Explanations of religious ritual are likely to be either informed by belief, or require book length answers to be rigorous.
I think you are on topic if you ask whether the practice existed. On the other hand you have two google results that confirm that the practice exists; if that was what you wanted to know, the question is answered.
I suspect you want to know more about the practice - how it was practiced and what it meant to the practitioners. While these are technically questions of historical interest (if we replaced "divination by wands" with "Dietary use of mutton" or "horse racing" or "marriage customs" I don't think anyone would question the historical legitimacy of understanding those things), I lack the confidence that we would have a consensus that the question is on topic.
Excellent topic for discussion in meta.