I have ordered from nirvana before and don't worry, he wont know what it is. I wont say how they hide them and suggest that you don't when you get them. They wouldn't write WEED in big letters on the envolope.
I can't remember exactly what it said on it but I don't think it had a name on it. It was a bigger envelope witha product inside that has nothing to do with seeds. They change it up every once in a while so it may be different now.