I would not be. How do you know they haven't come out for food and drink? Have you been watching them the entire ten ours? They can be pretty sneaky.
Typically with a broody hen the chicks spend a lot of their first couple of days under her. They will come out some, they will eat and drink some, but they spend a lot of time under her.
When I put chicks in the brooder straight from the incubator they typically spend a lot of the first couple of days near the heat. They are just not that active for a couple of days. They will roam a bit and eat and drink a bit but they seem to rest a lot. Hatching can be hard work.
How warm is it in the room where you have the brooder? If it is in a climate controlled area where you are comfortable and a breeze is not hitting them they can spend a fair length of time away from the heat source. Mine will in that weather if a broody hen tells them to. But left to themselves they can appear to be pretty lazy.
Moving them out and dipping their beak in water to make sure they know where it is would be OK. Putting them next to their food and tapping it with your fingers to try to entice them tp peck at it would be OK. Just moving them away from the heat a little and see if they go back would be OK. I kind of do that whenever I put them in the brooder. I always dip each beak and set some of them down where they have food. I put some near the heat. My broods are typically in the range of 20 chicks. They learn from each other.
If the chicks get cold, hungry, or thirsty they should start giving the distress peeping. That's a consistent slow peeping that tears at your heart. You know something is wrong just by the sound. If you hear that you need to so something. Until you hear that you don't have to do anything but you can if you want to. As long as you are gentle you won't harm the chicks and it may make you feel better.
