Well, our little boy ferret, Broots, got out of the cage somehow this morning. Brin actually alerted me to it, though I had thought he was just hiding. He called me about some work he was doing at the house and thought it was kinda cool that we had a weasel in the cage. When I got home for lunch, I looked for the other one that I assumed had been curled up in his bedding...like usual. He was not in the cage.
This is Broots, AKA the little shit machine.

Broots sleeping soundly
He's usually a lot more active than that, often trying to get out of the cage.
So they are in the piano room. There are french doors that were still closed, a closet, and (dun, dun, duhhhhn!) an open vent. But they can't get out of the cage right? I thought that was the case when I took the little "never-out" food dish out of the cage because Zoë was digging out all the food and then nosing her way up and out of the container!

Food dish like this
The food dish was like those pictured above, but smaller. So she would dig out the food and then squeeze into the hole and up the inside chamber. Then she would nose her way out. I just happened to catch her doing this so I took out the food dish and just put the food inside the cage. Since Broots is smaller, I knew he could much more easily do this. The dish had to go...
But I still am unsure how he got out. There is a top section of the cage that they could push on and he might be able to get out...and that is probably it--regardless, we have wire-tied it closed. But I wheeled them into the master bathroom where we play with them just in case the get out. At least I know that they cannot do *much* harm in there (or get out of the bathroom since there is only one door, a tight vent with holes too small for them to get through, and no exposed holes anywhere).
Plus their toys are in there.

Zoe in her Tube