Thanks for feedback. Yes, with some products this is normal. But this is not how Xiaomi Powerbank units are sold.

I previously bought 5+ units from Banggood and other sellers. They always come in a sealed retail box with authenticity sticker on outside - you need to scratch the sticker to reveal a code, which you enter on Xiaomi website to authenticate the product.

In order to come like this it means someone has opened the sealed box and removed the packaging. (or some other possibility - eg it is not genuine, factory return etc)