We are baby sitting a couple of balls right now and had one get out the other day. She went about 10 ft into another room and down into my boyfriends work boots.
So check shoes, anything that is big enough for her to hide in. We used to have a garter snake and when she got out she could end up anywhere in the apartment. Once she was curled up on top of the dvd player guess it's a great heat source, under a baseball hat, in the blinds, wrapped around the post to our bed, I found her in an easter basket full of candy once, in bed with us (nothing like getting woken up by a musting snake), under the bed, and in between the couch cushions. She lives at a serpentarium now, we got tired of playing find the snake, or being woken up at 3 a.m. because she was throwing herself against the aquarium or had already managed to dislodge the lid despite keeping textbooks on each corner.