Don't open the door
My daughter was made homeless because of Hurricane Sandy. As luck would have it, she found a very nice apartment, only 5 minutes away from me, and is doing great. many people have brought stuff to her for her family. Today someone knocked on her door, said he had a package for her. She responded, "can't open the door right now, just leave it on the steps and I'll get it in a few minutes." After the person left she opened the door to find NO package. Folks, you just can't be too careful these days. Don't open the door if you don't know the person.
This is also good advice for FSBO's