When my cockatiel was loose last summer it was four days before she came home. Even then, she couldn’t fly down, but she landed on a neighbors roof, so I was able to get closer to her. She kept making wider and wider circles away from our house. Sounds like what Ozzie might be doing. It’s teally hard to spot them sometimes up in the trees. Playing the owners voice and sounds from any other birds that they have is a great idea. I think the bucket truck is the best bet, but they need to break the rules and ditch the hard hat. Maybe bring a perch and treats up in it next time. I’m sure Ozzie’s owner must be so frustrated that she can’t go in and help. I hope they find her soon and get her back safely!