Some chocolates are sealed pretty well. Leaving them in the refrigerator, they can stay fresh for 1-2 months. Of course, if you open the package, they start to taste a little stale after just a week in the refrigerator. The only chocolate I've ever frozen are Snickers. It drastically changes the flavour when they are that cold and after a while, even in sealed packaging, they invariably got mild freezer burn.

We used to always keep some Belgian chocolates at our house: the kind that are different mixtures of chocolate and shaped like seashells. I don't remember the particular brands we got, but those things were danged tasty. They were such a delicacy that I would just eat 2-3 a week.

-Biscuits