Check the Humidity. Humidity is a BIG deal at this point of incubation. I forget how high it needs to be but it is crucial. If the air in the incubator is too dry you chicks may "pip" and then get trapped by the membrane inside the egg drying around them. Do you see any cracks or holes yet??? If you don't, give them a little more time. If the humidity is too low pour a little warm water in there to get it going.
Ooooh, you took the top off. Yikes! They need it wet and hot, especially right now. Unless your house is very warm and humid taking that top off could have bad consequences.
Get that top back on, raise the humidity and temp to the proper levels. I will do my homework and find out the exact numbers.
Hope all goes well for your ducks!
Edit: Okay, my brain skipped the part about them being in a cardboard box. I was imagining an incubator...alright, then I would put a bowl of very warm water under that light.(not just pour it in, sorry).
Try your best to get it humid. You might lose them but don't give up now.
Were you able to check the temp and humidity? If they've been internally pipped for that long and still haven't pipped externally, I'd put a small air hole in all of them. I'm surprised they haven't already run out of air in that time since they usually have 3 days of air at the very most before they suffocate. You are going to need to be very slow and very careful doing that if you do it, and you don't want to use anything really sharp. It's a tricky thing to do when you have eggs that are so dark you can't see inside them to get an idea where to make the hole.
