I just wanted to mention that mice pee... and pee ALOT. Their urine is full of ammonia, and that combined with the pine bedding will do them in quite quickly in that container that has no ventilation.

Ever tried sticking your head in a 10gallon tank that hasn't been cleaned in a week and only has 2 male mice in it? I will never do it again, let me tell ya. *faint*

High humidity isn't good for rodents, it messes with their respiratory tracts(sneezing porphyrin all over the place). If you can, get a bigger tub(or a couple big tubs) and only drill one hole for the water bottle, and replace the lid with wire mesh. It will save you alot of trouble in the STANK department, LoL. They will do much better separated into smaller groups and put into bigger cages. You won't have to break up fights, feed/water them as often, and especially won't have to clean those cages as often. Nice huh?