Wow, thats just such great news, well done to you and of course Harley for being a health smart grey.
There is always lots to take into account when a pet bird goes missing, I think being clipped not only reduces their chances of survival in flight terms, I also think it causes them some mental trauma, leaving them easily intimidated, when a bird is fully feathered and in flight it must really test their mental abilities, ie: where to land, where to manoever to, a constant thought process, which must give them immense confidence, i know my Echo can do figure of eight manoever in a 2m x 4m space, her capabilties are really surprising and she loves it, I also take her out in a harness to really build her muscles up. When she went missing the thought crossed my mind to have her clipped, even though i have always been against it, I had a conversation with Debbs(Billysprout) about it, she pointed out that Echo would never have survived if she had been clipped, and how right she was, I would not even dream of it now, its just so stressful when your bird goes, you dont know what your thinking, so well done to Dean for putting into action good plans to get Harley back, when your mind was such a mush x