I spent the rest of my shift worrying that they weren't ok and googling things and finding nothing. Which didn't make me feel any better. So on top of them both hitting the floor today they still haven't pooped. When I got out of work I rushed home and went straight in to look at them. I took the towel off the top of the box and they woke up and started yelling for food. This made me feel much, much better. So I got stuff ready and fed them in there with me and them on the floor. No more kitchen table. No more big cats allowed near them at all for a while.
After the feeding I went to my vet and got some more syringes and then went to petsmart and picked up a couple more cans of formula. The girl at the vet's office also gave me a pamphlet with orphan kitty care tips. There is a recipe for making your own formula for them. I might try that. I found a few other similar recipes on a website too. I'll give it some thought. For now, the KMR seems to be working out. The girl told me that I need to worry if their bellies get hard and/or they seem like they're experiencing discomfort. But so far they haven't been. They just haven't been pooping.