Sweet, thanks guys.
So I talked to my sister and the deal with the post cards is, it's a "friendly" competition to see who can get the most post cards from the most places. The project actually starts on Wednesday and will continue for some time, she didn't know how long. It's not just from the US but from all over the world. If you happen to know someone in an exotic location or somewhere no one ever goes have them pop a card over if you don't mind.
Thanks for the help.