We also use the Press n Seal and crack the egg boxes once weekly. I usually candle the eggs at that time or take photo's or whatever so they are likely open for a few moments of air exchange but not long enough to cool them unduly.
At day 53 I cut the eggs. After that I just use the lid of the box only and open the box every morning to check on the hatchlings and very lightly mist them from a small mister bottle I keep inside the incubator for that purpose.
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