Marie Antoinette's favorite chocolate store was next door to my hotel.

They, no doubt, delivered her orders. (I didn't buy any candy. In fact, I didn't buy anything while I was in Paris except food. Wasn't even tempted.)  There have been several Debauve and Gallais locations around the city.  This one has been here for a long time, maybe since the 18th Century, but I don't remember the exact year.  I'll check on that.