First- Sorry for the late reply, I have been on vacation and "off line".

Second: Do not give up. You'd be suprised how long they can survive on their own. One of ours was only a couple of months old when she escaped. It was winter and (although I'm in CA) it was still pretty cold. It was about a month later, we had begun to give up too .....and my wife happened to find her under some laundry in the cold garage. She was begging to come home where it was warm and the pinkies were plentiful.

Keep us posted, and keep trying.
MAP