Before you start saying this is a cuckoo topic, keep in mind that this is hitting mainstream news sources and congress is holding hearings on this. The first one recovered was in Italy in the 1930s.
Problem i see with it is if there was aliens here, they would have had to traveled much much farther than we can even fathom. So they are vastly superior to us in technology. They they just crash their super high tech craft onto the surface of the earth? Not buying it.