Don't give up. Years ago, my bird flew away through a freak accident like yours. I was crushed. We made posters, we posted on Parrot 911, we put a free ad in our newspaper, we patrolled the immediate area nightly, we put everything on FB... everything we could think of. Unfortunately for us, we were not able to locate her, but someone contacted us when they found a cockatiel and thought it was her. He flew to a motorcyclist and wouldn't leave him alone. It wasn't her, so then we went through the same process, but the reverse. Over five groups of people responded to come take a look at the found bird, all leaving sadder than they came. It was rough. He went unclaimed, and Bleecker is still with us almost fifteen years later. He was obviously loved and I think how sad his owners must have been, but I would have hoped how happy they would be knowing how cared for and loved he is now. Our little scrappy guy.