Oh ozgrrl, i was hopeing you would have some good news for us by now. So sorry to hear you haven't, but please don't give up hope just yet. When one of my cats went missing, after a month i gave up hope of ever seeing him again. Believe me when i say this,but after 48 days of him being missing, he turned up back home.
They were putting in new sewers around our area and we think he was lost in there. He came back in a very bad condition but we were able to nurse him back to health. That was about 12 years ago and he has since passed on.
So please don't give in just yet, you just never know.
My prayers are still with you and your beautiful featherbaby Cobba.
I also pray that you don't get any more of those stupid crank calls.
Try not to let them upset you, just pin it down to, like you said, street punks.
Take care