I'm sorry and I'm really not sure, I just know throughout my hatch I opened more than I should have and I got really worried over the chicks that were playing soccer with the eggs in the incubator so took them out and believe I am what caused my 5-6 full term chicks in there eggs to become shrink wrapped. Or at least from eggtopsies this is what looked like happened.So sad!
I know many on here will open at the end and tap the eggs and try to listen for life a day or two after day 21, but this time I plan to ONLY open for day 7, 14 and 18 to candle and then I am going to set up the bator so the chicks won't play soccer with all the other eggs and just try to practice a hands off policy lol it's so hard though!
Were you able to notice ANY signs of life from them? Did you candle and try to look for an internal pip? If you see this then immediately put them back and wait.
I did candle and tap but there were no internal pips, movement or chirps.