There are no hole in my tubs (holes means more moisture will evaporate) and I do not open the tubs for air exchange before the last week, again no need to mess with your egg boxes during incubation even with smaller tubs.
As far as my tubs I can see inside the tubs just fine without opening them.I am using those http://www.walmart.com/ip/Sterilite-...of-10/20699636 in the 7 quarts version mainly.