First move was to call my buddy Jeff and see if he had any same-age about-to-fledge babies in his boxes. He didn't, but he showed up to help anyway.
It's a very delicate thing, to try to integrate a jumpy fledgling into a box of jumpy about-to-be-fledglings. Still, if you can get it put in and if it stays, the parents will feed this miracle baby in the box and they'll feed it after it fledges, too. I call it cross-fostering.
Phoebe and I fed the baby overnight and all the next morning until she was strong and ready to go...somewhere... and I studied on it and thought and finally realized I had a box with babies who were the same age as her (although I'd assumed they'd fledged by now) and I might as well try to slip her in there. If they were still there... Here they are at day 11, when I had last checked them. Now, as I thought about it, they were Day 16. Yikes. Might already be gone.
So Phoebe and I saddled up and went over there and met Jeff. I took a sock with me to stuff in the box hole in case they all exploded in my face, being so ready to fledge.