Did you give them your SS# to avoid being beaten and arrested?
I actually did, because I had yet to have my eyes opened. They made it clear that I couldn't refuse and when they rest their hands on their guns, it really brings a sense of authority over you, especially when the second set of cops pulled up behind them. As it turns out they lied! Surprise! Of course they found nothing, and the fact that I was under no obligation to give them so much as my name really cinched it for me. (insert "You can't expect them to tell criminals that they don't have to talk to police, do you?" comment here)
The thing about the other cases is that I gave them a description of the perps, car and a license plate number. Response: "That's probably a rental and they're long gone." Dude! That was fifteen minutes ago! Maybe I should be glad they showed up even that quickly.