They seem dry but when food is in there and opening it few times a day, the Evaporator works harder extracting the heat to eliminate moisture build up, but its there on Hot day. This is also the unit that is the COLDEST part of the fridge due to this.
But even if it wasnt sealed you could still use it as 100% humidity will not harm the unit unless water is poured on directly.
But this unit is mostly for readign the ambient temps, and i still use the temp gun to spot check temps inside the tubs.