Well there is no "defining" moment but there is a chance they are ok. I would let them sit now till atleast day 25. A lot of times with fully developed eggs, you won't see any movement during candling. Sometimes you can see a little between the air sac and the chick, but you arn't going to see any now with them being cold. Give them a few hours to warm back up. Then if they haven't pipped, you can try to float test for movement. I would try that as a last resort however since the eggs have been through enough trama already. Lets say after you get home from work tonight.
How to do the float test....
Using a bowl, put enough water in it so the egg will float. MAKE sure your water is around 100 degrees. Take the egg out of the bator, and put it in the bowl. Watch it for a couple of minutes. What you are looking for, if you ever go fishing, is the bobber to move any at all. NOW this is not a defining test, but if they decide to move while in the water you will see it. NO MATTER the outcome I would still let them sit till day 25.
The Very last thing I would do.. Well I'll go into that later into this process. For now get them warm... once warmed you might see movement in the bator.. Just keep an eye on them.