You'll be able to see it and smell it.
The other thing you can try is having a regular box of litter - maybe like a plastic storage container so the sides are really tall and just cut down the front a little so it's easy to get in there, but the tall sides on three sides will limit the mess. Have this in addition to the dirt boxes. Scoop out some "dirt pee" and a poop from the dirt box, and put it in the box with litter. One of our kitties switched to using the litter box properly right away after doing this.
I'm so sorry you had to move in such a rush. We had the exact same thing happen to us last year.
That was really wonderful of you to commute to care for the kitties! And I'm so glad you were at least able to nab the kittens.
Laurie
The other thing you can try is having a regular box of litter - maybe like a plastic storage container so the sides are really tall and just cut down the front a little so it's easy to get in there, but the tall sides on three sides will limit the mess. Have this in addition to the dirt boxes. Scoop out some "dirt pee" and a poop from the dirt box, and put it in the box with litter. One of our kitties switched to using the litter box properly right away after doing this.
I'm so sorry you had to move in such a rush. We had the exact same thing happen to us last year.
Laurie