There was no nest anywhere, which could be because of the horrible gusts of wind we'd had the day/night before. And as I said, we left him outside yesterday all day until it started getting dark and cold, and mama hadn't been around in hours and hours.

I was told mama was outside today, so we brought him outside in the box and placed him by the tree we found him at and are keeping an eye on him to make sure the neighborhood toms won't get to him first. If mama doesn't show up for awhile, we'll bring him back inside for the night.

Thanks guys

EDIT: I also read on many many many bird websites that birds do not have as strong a sense of smell as many think, so even if you handle the bird the mama won't be able to "smell" you and won't abandon him as many may believe. There have been stories of humans handling babies and returning them outside a few days later and the mom still comes and takes them back.

We do wash our hands after handling him, though.