How to identify a fake Toshiba transistor?

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Hi!

I purchased 4 units of Toshiba 2SC1079 from the Canadian Pacific Semiconductors shop.

How can I identify if they are original or fake? As far as I know, the mentioned model was discontinued long time ago, so the transistors I purchased supposed to look old. However, the received transistors don't look like NOS, but too new for a vintage transistor.

Is there anyway to make sure they are not fake?
 
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