Question about Butterfly balls

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Hello to everyone. I've decided to search for some old celluloid balls and found an announcement about different kind of balls. Among the photos I have found a photo of some Butterfly 3-star balls. What amazed me the most is that the balls had the old Butterfly logo on them. As I started playing table tennis only 2 years ago, I have never seen that kind of balls. This seller also has some Nittaku and newer Butterfly balls.

How can I know if these balls are genuine or not? Any tips or suggestions are welcome.

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