Is this real 18w charger?

Hello. I just bought an 18w apple charger in Apfel Kiste, however, I didn't notice that it was a bulk original charger. Is there any way that I can check whether the charger is real or fake?

https://www.apfelkiste.ch/apple-18w-usb-c-power-adapter-mu7v2zm-a-iphone-ipad.html

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