I will be selling items on Etsy and I don't want to use my physical address for obvious reasons. I know that other people use them for this reason as well. I heard that there are websites that allow you to do a trace on a PO box and find that person's address. That's scary! So how safe are they? Is it possible to set it up so that I can't receive incoming mail? If you sell things throught Etsy, Ebay or similar sites how do you handle this?