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JimiMost N28s are pretty easy to tell if it is a fake. The white background and no borders makes it hard to duplicate without some sort of UV ("glossy") feel to it. As far as it not being trimmed. That's a tough call considering the same reasons I just gave you....no border. It is a Network54 guy, so I'd trust him, but if it were a different guy, I'd ask for dimensions.
Jimi