Question about naruto ninetails chakra and seal treasure.

On 2017-05-05 21:24:23 ｜ Show this Author Only ｜ Descending Order

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Here is stated that is possible to get naruto ninetails chakra in 'seal treasure', but in my server none has ever got neither 1 single fragment of him from it, nor he appears as a potential drop in 'seal treasure' as showed by moving the mouse over the related treasure (just like showed in the picture).
Is it a bug? Or is considered a super rare there (something like 400+ scrolls needed to get him)?
Thanks for your reply.