To be honest with you, I don't think you can really go wrong here. Since he is willing to send first, then you can activate it and make sure it works before you send the iPhone. The fact that he purchased it at employee pricing would not get it blacklisted. The only way you could really get screwed in my opinion is if he has it blacklisted AFTER he receives the iPhone, but I don't see why anyone would do that...unless he's that big of a loser and really wants to screw someone over. I would go for it if I were you....but you can never be too sure I guess, to each his own
-Jeff-