I agree with the others that the chocolates should be safe as long as they are declared, with one exception: I recall a thread a while back about people having Kinder Surprise chocolates taken away at the border. These are chocolate eggs from Germany with a toy inside. The FDA doesn't allow non-food items inside food.

I got a strange look recently from the CBP officer when I declared a pack of gummy bears on my way back from Madrid. But despite their reaction, you are safer declaring everything than taking the risk that a cranky CBP officer arrests you for an undeclared Snickers bar.