I hear it both ways; don't use your real name and use your real name.
Early on I used a fake name but one time the source sent someone other than the guy named on the form to pick up the funds and of course WU wouldn't let it happen. This required me to go to WU to get the money refunded and do the transaction all over again, which I couldn't do ... as you need ID in that fake name to get a refund , LOL. I thought I was fucked but luckily the source was finally able to get the original guy to go and do the pick up. And when you think about it think about it, how far is a fake name going to get you ?
So ever since , I use my real name ... and I'm not wild about it or all these transactions being stored in the places computer, either. This is why I really hate using WU and wish these guys would go back to cash in the mail.
As far as a PO box, I have a friend who does it that way. He said he'd get weird looks when getting an international package but he never a problem.
This is why I posted an 'amount ordered' question the other day . Since there's no way out of being in possession of a controlled substance ... the amount you have might make a difference in the outcome . But like some say, that all depends on where you're located and who's calling the shots that day.