Where to send seeds that are ordered online

So, the White Widow that I was suppose to get from a friend fell through. So, I decided that I should order them online. I was thinking Mandala or Marijuana Seeds. I have been been reading this site for a while back when they actually had a forum for seeds. Anyways, I sometimes read that I should not send my seeds to the actual house that will be growing it. Is this actually true? If it is, can I get some ideas of where to send them? I read a lot of posts saying the worst thing that happens is them just sending you a letter saying they removed them or whatever. Any ideas would be great, or just tell me I am overreacting. Thanks!

po box
very reliable friend

dont send to the house you will be growing in. your just asking for trouble if you do that. but mostlikely nothing will happen, but there is a greater chance

Aren't you suppose to have ID for a PO Box? Doesn't that kind of negate the whole purpose of sending it away from your house?