When you do start searching, do it systematically. Start at the place she got out and work outwards from there. Look in EVERY box, and everyplace she could possibly hide in, even if you think it's too small. They can squeeze themselves into the smallest areas, you'll be surprised.

Check every box, even if you think she couldn't have gotten inside. When I went searching for my juvie Centralian carpet, I found her inside a box stacked on top of other boxes. I never would have thought she could get that high up, but she did.

Good luck in your search. It sounds like the area is relatively contained so I'm sure you'll find her!