Wild Parakeet In My Backyard.?

Brief：
So, just today, I came home, and found that my uncle had caught a parakeet that had been found, sitting on my deck. Im guessing he was a pet that ende.. 

So, just today, I came home, and found that my uncle had caught a parakeet that had been found, sitting on my deck. I'm guessing he was a pet that ended up escaping, for he's very tame, easy to handle, and has a band with the numbers "36" around his leg. While I contemplate on keeping him, I also wonder if I should perhaps give him to a pet store or something. He's a rather old parakeet, at least around five years and up,and I fear that taking him in now may cause a lot of unwanted stress upon the bird, despite I know that parakeets love having human company. However, I was not about to leave him in the wildnerness. The United States is not their home country, and they are mostly suitable for pets, not wild animals. Or so I think. So I dunno, I need advice on what exactly to do with the parakeet. Suggestions would be greatly welcome!

Please first call your local SPCA and if you don t have one near you-any animal pet rescue center like it. Since there are so many different areas that the bird could fly off to-it is almost impossible to advertise this far to notify people of one being missing and I can t thing of any one place to advertise that would get to enough people. Even an advertisement in a paper - although it does reach a large number of people-how many check the classified section to check the Lost section. My first thought was to check the Animal Shelter and would hope if someone found one it would be the most logical place for them to report that they found one and for a owner to report that they have lost one.