What to do after saving a atoo?

So I just fended off a hawk from a atoo in my yard. It's a rose ed atoo and it has a slight wound on his belly. He seems fine, I whistled to him and talked to him a bit and I believe it calmed him down some. Now my question is, what do I do now? We certainly aren't going to keep it as I know whoever lost it must miss it. My mom just went out and she said she might head to the store for some things but really, I've never had such a big bird before and quite frankly it's mind boggling.